Optional participant:  Any known parent of either sibling being tested 

Probability of Half-Siblingship will indicate either:  <15% or >90%

EXCLUSION = <15%  (The likelyhood that they do share 1 common parent is very low; thus unlikely that that do) 

INCLUSION = >90% (The likelyhood that they do share 1 common parent is very high; thus it is likely that they do)  

* A free DNA self-collection kit is provided with prepayment of your DNA test (includes shipping and handling fees).

Please note, it is strongly recommended that a parent participates in the DNA test. However, with or without the parent, there is always the possibility that the results can be inconclusive.

If more than 2 siblings is to be included in the testing, the additional fee is $300 for each additional sibling.