I find this awkward, but you just reminded me of something Tyler. I was playing my family of Sims when I decided to check the good ol' family tree, to see if any babies came to Mei's (the mother's) sisters, because I really want her to be an aunt. Yet to my surprise there was another baby as her BROTHER! Now this wouldn't bother me if she weren't already the mother of 4 beautiful almost completely GROWN children (well two teenage girls, one child and a toddler), who now have a newborn uncle.
It's just strange I guess. Kind of reminds me of the movie "Father of the Bride 2" but with less humor.
Anyways they have an evil klepto uncle, can we say "Kids, it's time to move far away from your grandparents house which happen to be across the street, your uncle will probably come and rob us one day if we aren't careful!"
I only would have hoped that in the grandparents age they wouldn't need more biological children...