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How to Do DNA Testing for Siblings

Sibling DNA Test

Have you ever thought to yourself how can you be my sister/brother? We cannot possibly have the same parents. Probably this happens when your siblings annoy you.

The truth is how often do environmental conditions play into how we act or don’t act like our siblings? How often is straight up genetics?

If there are questions about whether you and a family member are legitimate siblings, a sibling DNA test is the answer for you.

Sibling DNA tests spell out if you share parent relationships with your siblings. Find out what DNA testing for siblings will tell you.

DNA Testing for Siblings

Sibling DNA testing looks for genetic markers in your DNA. Every human gets 23 of their chromosomes from each parent for a total of 46 chromosomes. 

While a large portion, 99.9% of your DNA, is like everyone else’s DNA. The .01% of your DNA is different. 

Scientists use this small part of your DNA to identify those genetic markers that would connect you to another person. The more matching markers you have, the more likely you have parental or sibling match.

Reasons to Test DNA

A sibling test of DNA is done for many reasons. Siblings want to identify if they share the same parent. They want this information for issues related to custody and parental rights. 

Siblings might need proof of paternity through DNA testing for immigration reasons or social security benefits. 

A deceased father cannot participate in testing. While an incarcerated or unwilling father won’t participate in testing, then siblings can use their DNA to see if they share the same parent or parents. 

Types of DNA Tests for Siblings

DNA testing has become popular for proof ancestry. There seems to be an abundance of testing options available. Choose a DNA test that will give you paternity information versus ancestry information.

There are several different types of sibling DNA tests.

Full Siblings Versus Unrelated

This test, often used for immigration purposes, test whether the siblings are likely to share the same mother and father or are completely unrelated. 

The DNA is studied to see they share DNA markers from both the potential mother and father. 

Full Siblings Versus Half Siblings

In this test, siblings know they share the same mother. The question is do they share the same father too. 

DNA is used from the siblings to check. If possible, DNA can also be used by the mother as well. This helps to identify if the siblings also share a common father or only one common parent. 

Half Siblings Versus Unrelated

This type of testing done so the siblings know they do not share the same mother but wonder if they share a common father. 

For most effective results, not only do the siblings submit DNA, but it is also helpful if the mothers do as well. 

The results can show what DNA came from different mothers and whether there is DNA from a common father. 

Sibling DNA Test

If you are a person who has questions about your parents or siblings, DNA testing can give you the answers. Sibling DNA tests help to identify whether you share one or more parents between you and a sibling. 

Contact us today to get more information about our sibling DNA testing options.


Order a Test

Whether you are an individual looking to get a drug test done today or an employer looking to get a pre-employment drug test done today, ordering a test online is easier than ever! Just submit your order online, receive your test authorization by email, go to your local clinic to be tested, and receive your test results in 24 to 48 hours.

Hours of Operation

Monday 8AM–12PM, 1–4:30PM
Tuesday 8AM–12PM, 1–4:30PM
Wednesday 8AM–12PM, 1–4:30PM
Thursday 8AM–12PM, 1–4:30PM
Friday 8AM–12:30PM, 1–3PM
Saturday Closed
Sunday Closed

If you have any questions, please do not hesitate to contact our lab.