If your son and daughter have children they are first cousins what would their uncles children be to them in kin?

Answer 1

To determine the kinship if two people, you have to trace their heritage back to a common ancestor. If your son has a child, and your daughter has a child, then these two children find a common ancestor by tracing their ancestors back to the ones they have in common. In their case, the common ancestor would be you and your mate (assuming your two children are full siblings), you are their grandparents, which makes them first cousins. If these two children had children, their closest ancestor would still be you, but you would be their great-grandparent, so these kids would be second cousins. When one side if the ancestry chain is longer than the other, that is when you get into the "first cousin, once/twice removed" territory. Your question is a little ambiguous, but I assume the uncle in question would be the uncle of your son and daughter (the brother of you or your mate), not the uncle of the children your kids have, since that would be the son you originally mentioned, or another of your sons. Assuming the uncle is of the same generation as you, his children would be your children's children's first cousins, once removed. We can trace their lineage back to your parents (or your mate's parents, depending on which side). These would be your kids' kids' great-grandparents, and your kids' uncle's kids' grandparents. Since there is one generation of difference between these relationships, they are once removed from being true first cousins, but they are still more closely related than second cousins. I know that is pretty confusing, but I hope I answered your question.