Half or full siblings? Another interesting and informative blog post from Judy Russell about how to tell if siblings share the same parents or just one parent.

Half or Full…

I recently had just such a case of borderline 2018cMs, but found that, if the expected family tree is known, checking the shared matches of the two siblings will generally show if one of their parents is different, because they will have matches in common on one parent’s side but not on the other.