- Charlotte: It's actually not as uncommon as you think. I grew up in the foothills of the Cleves, and there was more than one grandmother who was also her grandchild's aunt. In this case, the mother is also the aunt, which I admit is a bit complicated. As the father is the mother's nephew, which would make Kofun and his son cousins. No, wait. I think. Yes, that's right. And that makes you the baby's aunt and cousin as well.