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Sibling Test

Determine whether two people share one or both biological parents. We review every case personally and contact you before any payment is collected.

Begin your DNA testing process

All details are confidential. Nothing is charged today.

1 Your contact details

You are opening this case. You will receive the case number and portal link.

If a doctor's office, funeral home, law office or another business gave you a card or a code, enter it here. Leave it blank if nobody referred you.

2 Test type

You arrived from the Sibling Test page. Need a different test? See all tests

Sibling Test
Confirmed by our team during personal review.
Personal testing is not admissible in court, and a personal collection cannot be upgraded afterwards. If there is any chance you will need this in court, choose Legal. If you are unsure, call us before you book — there are options we can talk through with you.
3 Who is being tested

Each person needs their full name and the city where their sample will be collected. They do not all have to be in the same place. If a mother is known to be shared by both siblings, include her — she is already covered by the base price.

A known shared parent is the difference between a clear answer and a vague one. Siblings inherit different halves of the same parents, so two full siblings can share more or less DNA by chance. Testing a parent both siblings are known to share lets the laboratory work out what is inherited and what is coincidence.
4 Preferred appointment

Optional. We schedule each participant individually and confirm by email and text.

5 Consent and authorization

Required by law before we can process genetic samples.

Every adult being tested consents separately. Each adult signs their own consent at collection, on the laboratory's form. During our review we confirm that every adult is willing to take part — which means you find out early if someone will not, before you have paid anything.
Please complete the three consent confirmations above to submit.

By submitting, you agree that Divine DNA may email you about your case and, occasionally, about our own services. You can stop the occasional emails at any time. The other people on your case are never emailed for that purpose.

Submitting a request does not create a testing agreement and does not charge you. Our team reviews every case and contacts you before any payment is collected.

Two adult sisters, side by side
Illustrative photograph
What this test is

A sibling test compares the DNA profiles of two people to estimate whether they share both biological parents, one, or neither.

Two questions can be asked. Full siblingship asks whether the two share both parents. Half siblingship asks whether they share one — usually a father. The laboratory reports a sibling index and a likelihood of the relationship rather than a single percentage, because siblings inherit different halves of the same parents and the amount of DNA any two of them happen to share varies.

This is the least clear-cut test we offer, and it is worth knowing that before you order. Half-sibling cases in particular can come back inconclusive. Two things fix that more often than anything else: testing a parent both people are known to share, and testing any additional siblings who are willing. Tell us who is available on this form — we will tell you what the test can realistically settle before you pay for it.

Function and purpose
  • Confirming whether two people share a father, a mother, or both
  • Estate, inheritance and probate matters
  • Social Security and survivor benefit claims
  • Adoption reunions and family separated by time or distance
  • Private peace-of-mind answers for the family
If the parent in question can be tested, test them instead. A direct paternity or maternity test costs less and gives a far more definitive answer than comparing siblings. If you are not sure which test fits your situation, call us before you submit.
Immigration cases work differently. Immigration DNA testing follows a separate process set by the U.S. Department of State and must be arranged directly by the petitioner through an AABB-accredited laboratory. Call us and we will walk you through it.
Industry standards
  • Results are reported as a combined sibling index and a likelihood of relationship, not as a single 99.99% figure.
  • Testing a parent both siblings are known to share substantially improves the result.
  • Half-sibling comparisons are less definitive than full-sibling comparisons and are more often inconclusive.
  • Legal (chain-of-custody) tests require photo identification, witnessed collection and tamper-evident packaging.
  • Testing is performed by an AABB-accredited laboratory, accredited for Relationship Testing Activities, using dual-technician review.
  • Standard turnaround is 2 to 3 business days after the final sample arrives at the laboratory.