It's okay, I'm always hesitant to distribute weight oddly between couple. The one I just made is the wife has a fuller figure, and her husband's slightly skinnier. I made it that way because she will be a stay at home writer.
As for the hair, she didnt have grandparents. Both her parents were made in CAS and moved in as room mates in a tiny cabin I made. Weird little blonde children...I turned it black in a mirror, since it creeped me out. Still, I wonder if the game was resistant to use her mother's hair for anything...I was a bit sad neither child got her eyes either, they were a pretty gold.