My two oldest daughters found 6 older siblings through their Ancestry DNA matches. Is there a test they can do to see if they are full siblings? We were always told they were half siblings, but the man who the mom named as the youngest ones father is African-American and the father of one of the older sibs. My daughter has no African ethnicity. We are now wondering if both girls might have the same dad. Is there a test that would show this? We do not know where my oldest's birth father is so we cannot ask him to do a DNA test.