Sibling DNA Test Kit | At-Home Full or Half Sibling Test

Turnaround for sibling testing

Results are typically completed and emailed within 2 to 3 business days after the lab receives and accepts all required samples and the completed Result Notification Form.

Why sibling testing runs longer than paternity

Paternity testing is a direct parent-child comparison, which is a simpler genetic question. Sibling testing is more mathematically involved because the lab is comparing two people's markers against each other and calculating likelihoods for three possible relationships (full, half, or not siblings). The extra statistical work happens inside the 2 to 3 business day window.

What can extend the timeline

The most common cause of delay is a swab arriving with insufficient DNA. Your specialist contacts you before running the comparison if either swab is low-DNA. Weekends and holidays are not counted in the turnaround.

Support for Understanding Your Sibling Results

Every case is assigned a dedicated DNA Specialist who explains what the DNA evidence supports, including any inconclusive result, and answers your questions about the report.

What your specialist handles

• Confirms all required samples arrived and match the case paperwork.
• Contacts you if either swab appears low-DNA before running the comparison.
• Coordinates adding a possible parent's sample if you want to strengthen the result.
• Explains the difference between "full sibling" and "half sibling" likelihoods if the result isn't clean.
• Advises on whether testing an additional relative would strengthen an inconclusive result.

No portal, no barcode, no account

Nothing to activate or register.

Discreet packaging both ways

The kit ships in a plain FedEx envelope with "Confidential" as the sender, no branding, no DNA-related language.

Private billing

The charge appears as "MFD" on your credit card or bank statement.

DNA handling

• Physical samples destroyed after testing per laboratory protocol.
• No consumer DNA profile is built or stored.
• No upload to ancestry, genealogy, law enforcement, or research databases.
• DNA data is never sold, licensed, or shared.
• The result PDF is emailed only to the authorized recipients listed on the Result Notification Form.

Sensitivity in adoption reunion cases

Sibling testing is often part of an adoption reunion or family reconnection. Coordinate with your specialist about how the result should be delivered if the case is emotionally weighted. Discuss any delivery preferences with your DNA Specialist before testing and list the authorized recipients on the Result Notification Form.

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Every kit contains

• FDA-approved cheek swabs for the siblings included in your order.
• DNA sample envelopes for each participant, individually labeled.
• Illustrated step-by-step collection instructions.
• Result Notification Form listing the authorized recipients of your results.
• Prepaid trackable FedEx return envelope in plain packaging for U.S. orders.

What the order covers

• Kit shipped to your address via FedEx.
• Prepaid return shipping to the lab for U.S. orders.
• All laboratory testing fees for the sibling comparison with dual processing plus Amelogenin.
• A dedicated DNA specialist assigned to your case.
• Confidential results as a full-color PDF by email.

Why Include a Mother’s DNA Sample?

If two people share the same biological mother and want to know whether they also share the same father, including her DNA helps the lab identify which genetic markers came from her. This can make the result more conclusive.

If the two people have different biological mothers, a sample from at least one mother is especially helpful when testing whether they share the same father. Testing both mothers may strengthen the analysis further. No sample can guarantee a conclusive result.

One mother’s sample is included at no additional cost. Select “Yes” when ordering, or contact your DNA Specialist before returning your samples.

How It Works

Step 1 · Order and receive the kit

Kit ships within 1 business day in plain FedEx packaging.

Step 2 · Collect cheek swabs

Each sibling collects two cheek swabs by rubbing each swab against the inside of the cheek for 60 seconds.

Step 3 · Air-dry the swabs

Let swabs air-dry at room temperature for at least 30 minutes before packaging.

Step 4 · Package samples separately

Place each participant's dry swabs into their labeled envelope. Complete the notification form.

Step 5 · Ship samples to the lab

Put everything into the prepaid FedEx return envelope. Drop at any FedEx location.

Step 6 · Lab logs samples and confirms intake

Your specialist confirms intake.

Step 7 · Sibling comparison

The lab runs the sibling comparison with dual processing over 2 to 3 business days.

Step 8 · Report delivery

The full-color PDF report is emailed to the authorized recipients listed on the Result Notification Form. Your specialist walks through the likelihood ratio, especially if the result comes back as half-sibling or inconclusive.