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    Best DNA Test Kit for Siblings of 2021- Everything You Need To Know

    Whether you’re looking for long-lost relatives or birth parents, DNA testing can give  you the results you need to track down biological relatives. Sibling DNA tests determine the percentage of DNA shared by two people to make them a full or half-siblings. 

    These tests are also useful for paternity testing when samples of parents are unavailable. Finding unknown or lost relatives from around the world becomes effortless when you upload DNA samples to the database of a reputable testing service.

    The following article will guide you through the fundamentals of Siblings DNA tests. You will also find out more about four top DNA testing companies which specialize in them.

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    Is My Sibling’s DNA Identical To Mine? 

    While all humans’ DNA is 99.5%  identical to each other, the remaining 0.1% is the significant part that makes us unique. No two people can have the same DNA, 100%. In fact, even identical twins do not quite have 100% identical DNA, despite common belief. Needless to say, your DNA can never be identical to your sibling’s. 

    How Much DNA Do I Share With My Sibling? 

    Siblings share around 50% DNA, on average.  A sibling DNA test can find the percentage of the relationship by comparing both your DNAs. Alternatively, half-siblings share up to 25% of their DNAs as they have one common biological parent only. 

    My Siblings and I Have Different Ancestry DNA Test Results  

    Biological siblings can have different ancestry DNA results. Understanding that DNA does not pass down generations as giant blocks, but in small boxes makes it easier to understand. During fertilization, half of mother’s and father’s genetic material is mixed and reshuffled. This creates a unique DNA for each of the children and is also known  as genetic recombination. 

    If your recent ancestors were genetically diverse, the recombination will be more pronounced. Often called a genetic lottery, genetic recombination can awaken or suppress traits to create dissimilar ancestry DNA results between siblings from the same parents. 

    Siblings DNA test - Results Accuracy 

    As the egg and sperm meet, new and unique DNA is created. During fusion, new combinations of DNA will form, and siblings will be born with different DNAs respectively. The gist is that there’s a new genetic shuffle upon every fertilization. Nevertheless, finding out if a person is your sibling by assessing the percentage of your shared DNA is easy. The shared DNA percentage goes down the further you go - from 50% for siblings, to 25% for half-siblings and so on. 

    The siblings DNA test kits helps to prove full sibling relationship, half sibling relationship or zero relationship. Keep in mind that no DNA test is 100% accurate. The best result gives you a high probability of proof that two people are related. On the contrary, paternity tests are first-degree relationships and hence more accurate than sibling DNA tests. 

    The main factor that affects the accuracy of sibling DNA testing is the number of locations used by the laboratory. The average number of compared laboratories is 15 to 16 while the ideal range is 20 to 30. Once the DNA database accumulates large data from all over the world in the future, results will be more accurate.

    There are two types of sibling tests as indicated below:

    • Dedicated Sibling DNA Tests: Custom-made for legal proof of relationship whether for a court or private files. 
    • Ancestry DNA Tests: Non-admissible in court, these tests support the claim of sibling relationship. It can also shed light on your ethnicity and family tree. 

    To find accurate results, the DNA material of both the siblings and the parents are recommended for testing. 

    Finding Your Long-Lost Sibling

    Discovering lost siblings is easy with DNA testing because you can upload a sample and receive results online. Sibling DNA testing evaluates the probability of two or more people being full siblings, half siblings or holding any relationship with one other. Every test includes details of your ethnic ancestry.

    Suppose you lost contact with your sister a long time ago. To find anyone who matches your DNA, you need to upload your genetic material to a DNA testing database. The system will look for genetics that match your genes, at various percentage levels. 

    It may find your sister, provided she has uploaded her details to the same service too. If you don’t find a match right away, there is a chance your sister’s DNA material will be uploaded to the database in the near future, and then a match will be found.

    Full Siblings Test and Half Siblings Test

    There are two types of sibling DNA tests to determine the probable percentage of DNA shared between two or more individuals. Both the tests include sample collection and can be completed at home or in a laboratory. 

    Full siblings have both biological parents in common, but the siblingship test assumes one known parent here. The DNA test for half-siblings holds one parent in common and determines if any or all of the parents are shared. This test establishes proof of a biological relationship between siblings when there is no sample available from the alleged parents. 

    To complete the test, select the total participants and order your DNA testing kits from the service of your choice. Once you get the kit, collect samples, seal and return them to the laboratory. Receive the results by email within 1 day to 8 weeks depending on the testing laboratory and mode of testing. 

    Our Top Siblings DNA Test 

    When you’re searching for the right DNA testing services for your ethnicity, compare the strengths and weaknesses of each company. You need to choose a company with an extensive database of ethnicities, certifications and a feasible turnaround time for your needs. 

    My Heritage

    Price: $79 to $299 

    Time to Receive Results: 3-4 weeks 

    With a database of over 11.9 billion historical records, chances of finding a sibling via My Heritage are high. It is a CLIA-certified and CAP-accredited DNA testing service that started as a genealogical research service. The best thing about this company is its quick turnaround time. 

    With access to over 42 languages, this testing service also supports 42 ethnicities. For finding lost siblings, collect and upload your DNA sample on My Heritage and wait for a match. The vast diversity of their genealogical databases makes them stand out from other DNA testing kits. 

    The following five points will outline why My Heritage is a good choice for siblings DNA tests. 

    • Collection method: You can provide the DNA sample with a cheek swab. 
    • Type of Sibling DNA Testing: Microarray-based autosomal DNA testing calculates DNA matches from paternal and maternal ancestral lines. 
    • High Percentage of DNA Matching: The Founder Populations Project by My Heritage collected DNAs from multiple ‘unique founder populations’ across the globe leading to better matching.  
    • Complete Record of Ancestry: My Heritage shows your connected matches in addition to the ethnic and geographic record of your ancestors. 
    • The Perfect Gift: Offer a DNA testing kit to family members so that you can get to know more about the family tree. 


    Price: $59 to $119 

    Time to Receive Results: 6-8 weeks 

    Totaling over 20 billion records, Ancestry is an integral part of the Ancestry group of companies that records over 15 million users. It is the one-stop-shop for all your genealogy questions. This is more of an affordable ancestry DNA test and not a dedicated siblingship test. Take the test with your family to find more about your ancestors. 

    With no subscription needed to access results, you can use Ancestry for enhanced DNA matching to find siblings. Currently available in over 30 countries including the United States, this can predict the siblingship between two people accurately too. 

    Below are five reasons that make Ancestry a good choice for siblings DNA tests. 

    • Collection method: You can send your DNA sample via collection of saliva.  
    • Type of Sibling DNA Testing: Microarray-based autosomal DNA testing covering all lineages and surveying over 700,000 locations of the genome.
    • Large Selection of Ethnic Regions: Supports over 500+ ethnic regions and thus offers the most extensive collection of DNA results.
    • Unravel Your Family History: Ancestry predicts your genetic ethnicity and is ideal for family tree research with its ethnicity map.
    • Free Trial: The 14-Days Free Trial is a risk-free way to find out if DNA testing is right for you.  

    Living DNA

    Price: $89 

    Time to Receive Results: 6-8 Weeks 

    Testing DNA since 2004, Living DNA is the successor of DNA Worldwide Group. What caught our attention is their affordable siblingship testing solutions on top of free shipping. Having multiple types of genetic mapping is also ideal for proving siblingship when testing for biological relations. 

    Living DNA supports 80 ethnic regions with 21 regions exclusively for the UK and Ireland. The outstanding feature of this DNA testing service is its extreme focus on privacy. The platform is currently developing nutrition and fitness reports with DNA testing as well. 

    Find out the five best features of Living DNA below:

    • Collection Method: You can send your DNA samples with the cheek swab method.  
    • Type of Sibling DNA Testing: Available tests are Autosomal, Y-DNA (paternal) and mtDNA (maternal). 
    • Free DNA Upload: It is easy to compare your DNA results on Living DNA Database even if you tested via other companies. 
    • High Definition DNA Testing: Ideal for narrowing-in on the precise ancestral regions of British Isles, European and African Ancestries. 
    • In-Depth Ancestry Analysis: Living DNA offers advanced technologies such as interactive map, geographic mapping, and patrilineal testing. 


    Price: $79

    Time to Receive Results: 2-3 weeks 

    The first company to use autosomal DNA testing, 23andMe even features an exclusive option for finding lost siblings. Called the DNA Relative Finder, it can help you message and arrange meetings between lost siblings or relatives.  We appreciate their quick turnaround time, which also surpasses the competition. They also offer a chromosome browser for detailed result comparison. 

    The best brand for genetic health testing, this is a CLIA certified lab. While it is more expensive than the others, 23andMe offers genotyping unlike their counterparts. We appreciate the privacy of this service provider because it lets you delete your details from the database. 

    Below you will find the main factors that make 23andMe one of the best options for sibling DNA testing. 

    • Collection Method: You can submit your DNA sample on this service by saliva collection.  
    • Type of Sibling DNA Testing: Available DNA testing types are Autosomal, Y-DNA and mtDNA. 
    • Largest Group of Ethnicities: With over 1500 ethnic regions in the database, matching with individuals like your siblings or relatives is easy.
    • Free Traits Report: More than 30 trait reports are offered for users without any added costs. 
    • Mapping the Family Tree: Ancestry testing is the main focus with an automatic Family Tree builder accessible to users.


    Sibling DNA testing is the ultimate way to confirm your ancestry and find out more about your ethnicity. Today, you can order these tests online and get the results from the comfort of your own home. It is useful for knowing if two people are full siblings, half siblings or not related at all. Moreover, these tests are constantly updated, meaning that if you don’t find a sibling match today, you might find a surprise sibling-match tomorrow.