6 children Here, 3 each from different Mother's, ironically it's me and a half sibling that are really into geneology, so we wouldn't mind, for the sake of identification. I think this would work as a side tag, perhaps, I realize the math, for the relationship finder, Since each profile is unique...Ie..Half siblings listing different parents, the same one parent...I don't think it would upset the algorythim, but, I think I have seen this....