Recently, whenver i use Relationship Finder, the Most Recent Common Ancestor of the two persons compared turns always out to be a woman, an ancestress, instead of an ancestor, as before. Upon closer look, i always find that the husband is also a MRCA of the two persons being compared. Why is this happening? This makes it seem as if the two persons being compared are descended from an unwed mother, or from the same ancestress but two different ancestors. Why is this?