← DNA & Paternity · DNA Relationship
Legal Test🧬 Siblingship⚖️ Court-Admissible

Legal Siblingship Test

A court-admissible test that determines whether two people are full siblings, half siblings or unrelated. Collected under witnessed chain-of-custody. Results usually 2–5 business days after the lab receives the samples.

$ 399 covers both people’s collections, the lab work, and the court-admissible report.

$ 399.00All-in price
1Tests included

A sibling DNA test compares the DNA of two people to determine how they're related: full siblings (same mother and father), half siblings (one shared parent), or unrelated. It's often used when a shared parent can't be tested, to settle questions of inheritance, benefits or family history, or simply to confirm a biological connection. Collected under chain-of-custody, the result is admissible in court.

Included Tests

Legal Siblingship DNA Analysis
Compares the DNA of two individuals across a wide panel of genetic markers to determine whether they are full siblings, half siblings or unrelated. Collected under documented chain-of-custody so the result is court-admissible.
Sibling 1Sibling 221+ genetic (STR) markers
incl.in panel

What This Panel Measures

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Type of sibling relationship. Distinguishes full siblings, half siblings and unrelated individuals based on how much DNA the two people share.
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Combined sibling index. Reports a probability and index showing how strongly the DNA supports the relationship in question.
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Legal admissibility. Witnessed collection and a documented chain-of-custody make the signed result acceptable to courts and government agencies.
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Stronger with a known parent. Including a shared parent, when available, helps the lab distinguish full from half siblings with greater certainty.

Who Should Get This Panel

  • You want to confirm whether two people are full or half siblings
  • A shared parent is unavailable, deceased or unwilling to test
  • You need to establish a sibling relationship for inheritance, benefits or immigration
  • You want a legally admissible result and both people can be collected under chain-of-custody
  • You're seeking peace of mind about a biological connection between siblings

Conditions Screened

Full vs half sibling determinationCourt-admissible proof of relationship

Related Symptoms

Shared parent unavailableInheritanceImmigrationFamily certainty

When to Get Tested

Whenever you need to establish or rule out a sibling relationship (often when a parent can't be tested directly). The result is strongest when a known shared parent is included, since that helps separate full from half siblings. If the result may be used in court, choose the chain-of-custody collection.

Understanding Your Results

Results post to your secure online account, usually 2–5 business days after the lab receives both samples. Because siblings share a variable amount of DNA, the answer is reported as a combined sibling index and probability rather than a simple yes/no: a high index supports the tested relationship (full or half sibling), while a low one makes it unlikely. Including a known parent gives the clearest result.

Frequently Asked Questions

Can these results be used in court?
Yes. This is a legal test collected under a documented chain-of-custody (identities are verified and samples handled by neutral staff), so the signed result is admissible for inheritance, benefits, immigration and other legal matters.
How accurate is a sibling test?
It's a reliable, well-established method, though it reports a probability rather than the near-absolute 99.99% of a direct parent-child test, because siblings share a variable portion of DNA. Including a known parent strengthens the conclusion.
How does the collection work?
Each person provides a quick, painless cheek swab at a test center, where each person's ID is verified. Participants can be collected separately, and adding a shared parent improves certainty.
Is this billed to insurance?
No. You pay directly here, and nothing is billed to insurance. Your results go only to your secure account.

Pairs Well With: Same Blood Draw

Legal Avuncular DNA Test
Confirms an aunt/uncle relationship when the father can't be tested.
+ Add
Legal Grandparent DNA Test
Uses a grandparent's DNA to establish a paternal-line relationship.
+ Add
$ 399.00
✓ The price you see is the price you pay. No draw fees. No physician fees. No surprise bills. $ 399.00 is all-in.
Comparing prices? Some self-pay labs advertise a low number, then add ~$28 in "lab & physician fees" at checkout. We don't. What you see here is the whole cost.
⚡ We send your lab order electronically to the test center in 2–3 minutes. Nothing to print, nothing to bring. Just walk in and sign in.
📍 Can you get tested nearby?

Test centers don’t accept payment. You pay securely here; the lab just does the draw.
⚡ Results 2–5 business days after the sample is received🧪 1 tests

What happens after you order?

  • 1Your lab order form & test code appear in your secure online account, with your test center’s address.
  • 2We send your lab requisition to the test center electronically.
  • 3Walk in & get tested. Tests usually take 5 minutes or less.
📞 Need support? (866) 873-0879
$ 399.00all-in · no extra fees