About This Home Sibling DNA Test Kit
The My Forever DNA® Sibling DNA Test accurately determines whether two or more individuals are biologically related as full siblings, half siblings, or not biologically related as siblings - privately from home with trusted laboratory standards, advanced DNA analysis, and real human support.
No Barcode to Register | No Online Portal | DNA Results Delivered with Care
What a sibling DNA test can determine
A sibling DNA test compares genetic markers between two people who might be siblings and returns one of three outcomes:
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Full siblings (both share the same biological mother and the same biological father).
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Half siblings (both share one biological parent, either the mother or the father).
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Not biologically related as siblings.
The test does not identify which parent is shared in a half-sibling result. It only indicates whether the shared-DNA pattern matches a full sibling relationship, a half sibling relationship, or neither.
When to test siblings without the parents
The most common reason to order a sibling test is when one or both parents cannot be tested (deceased, unreachable, or unwilling). This is the "sibling dna test without parents" scenario that shows up in search data. The sibling comparison is the strongest available route to biological answers in that situation, though it isn't as conclusive as a direct paternity or maternity test.
Full siblings vs. half siblings: what the numbers actually mean
Full siblings share approximately 50% of their DNA. Half siblings share approximately 25%. The test measures the pattern of shared markers and calculates a likelihood ratio for each possible relationship. A strong result clearly indicates full or half siblings. A moderate result is more ambiguous. An inconclusive result usually means testing an additional relative (a possible parent, grandparent, or aunt or uncle) would strengthen the finding.
When adding a possible parent's sample helps
Including a possible parent's cheek swab strengthens sibling test results by letting the lab identify which side of the family the shared DNA came from. This is especially useful when the result comes back as half-sibling and the family wants to know which parent is shared. Coordinate with your specialist before shipping if you want to add a parent to the case.
How accurate is a sibling DNA test?
Testing runs through a US-based AABB-accredited and CAP-certified laboratory partner with dual processing plus Amelogenin for gender identification. The lab tests 46 DNA genetic markers for sibling testing. My Forever DNA guarantees a specific 46 DNA genetic markers on every sibling test.
For comparison, this is 46 DNA genetic markers vs. the industry-standard 16 markers used in many at-home sibling tests. More markers provide more data points for the statistical inference required in sibling comparisons.
Related product options
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Multiple Location Sibling DNA Test: for cases where the two possible siblings live at different addresses.
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DIY Sibling DNA Test: for cases where no kit should ship to home (customer supplies own cotton swabs).
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Discreet DNA testing options: for cases where a cheek swab is not possible from either participant.
