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Full Siblingship Test (Without Common Parent)

Full Siblingship Test (Without Common Parent)

Two people checking whether they share both parents, no parent available

Participants:
Two Siblings
Lab processing:
5 business days after the lab receives your samples
$179.99

Quantity

1 pack·$179.99/test$179.99

Order with these add-ons (optional)

Overview

This option estimates whether two people share both biological parents using only the two siblings' samples. It's the right choice when no parent is available to test, though including a common parent (see the companion test) gives a stronger result.

Sibling relationships are reported as a likelihood. This is a private, peace-of-mind test — it is not chain-of-custody and not admissible in court.

What you get

  • Cheek swabs for the two siblings
  • Step-by-step illustrated instructions
  • Pre-addressed return mailer or FedEx label
  • A private results report with a relationship likelihood by email

How it works

  1. 1

    Order your kit

    Choose your test and check out online. No appointment or doctor's order needed.

  2. 2

    We ship within 1 business day

    Your collection kit ships free with cheek swabs, step-by-step instructions, and a return mailer.

  3. 3

    Collect samples at home

    Each participant gently swabs the inside of their cheek. Painless and takes about a minute per person.

  4. 4

    Mail samples to the lab

    Drop your samples in the mail using the supplied envelope. Prepaid Return Mailer or FedEx Overnight Label Provided. Lab processing time starts when the lab receives your samples.

  5. 5

    Receive results securely

    The lab sends your report to us and we forward it to you privately by email.

Turnaround timeline

  1. 1
    Kit ships — Within 1 business day of your order.
  2. 2
    In transit to you — A few days, depending on your location.
  3. 3
    You collect & mail back — At your own pace. The clock for lab processing has not started yet.
  4. 4
    Lab processing — 5 business days after the lab receives your samples.
  5. 5
    Results delivered — Sent to you privately by email.

Accuracy & methodology

Without a parent, the lab compares the two siblings' DNA directly and reports a combined sibling index and probability. Results are more conclusive when a common parent is included. Testing is performed by our accredited partner laboratory.

Testing is performed by our AABB-accredited partner laboratory.

Your privacy & trust

Your privacy matters to us, and DNA information is among the most sensitive personal data there is.

  • Samples are used only to perform the test you ordered and are destroyed after testing is complete. <!-- TODO: confirm exact sample-retention window with fulfillment lab before publishing -->
  • Results are delivered privately by email and are never sold, rented, or shared with third parties for marketing.
  • Your DNA data is treated as sensitive personal information. While at-home, informational tests are generally not covered by HIPAA, we handle your results with comparable care.
  • You can request deletion of your records at any time by contacting us.

Frequently asked questions

Should I add a parent if one is available?
If you can, yes — including a known common parent makes the result considerably more conclusive. Choose the 'with common parent' test in that case.
Is this admissible in court?
No. It is for personal information only and cannot be used in legal proceedings.

Related tests

Full Siblingship Test (With Common Parent)

Full Siblingship Test (With Common Parent)

Two people checking whether they share both parents, with a known parent available

Participants:
Two Siblings, One Common Parent
Lab time:
5 business days
$179.99View test →
Half Siblingship Test

Half Siblingship Test

Two people checking whether they share one biological parent

Participants:
Two Siblings (common parent optional)
Lab time:
5 business days
$179.99View test →
Avuncular Test (Aunt / Uncle)

Avuncular Test (Aunt / Uncle)

An aunt or uncle and a child estimating a biological relationship

Participants:
Aunt or Uncle, Child (mother optional)
Lab time:
5 business days
$179.99View test →

Need a legal DNA test?

Need results for a custody case, child support, immigration, or any other legal matter? An at-home test cannot be used for those purposes. You'll need a court-approved, chain-of-custody DNA test performed through an accredited laboratory, where a neutral third party verifies every participant's identity and handles the samples.