I'm doing something like this, though my project is to attempt linebreeding Sims. LOL. I have Star, he's a Young Adult and my only immortal with aging on epic. I created his wife because the traits I'm after are white hair, green eyes. They stand out in a crowd. So far they have five children, four of whom have received the white hair/green eye combo. Baby number four has game base black hair, and this sort of plum shade of purple for eyes. Alas, she will not have a mate with white hair and green eyes created for her, and will be living out her life at home. The other four kids will marry though. I'll create, add to game, have them marry one by one and move out to start their own families and hopefully more white haired, green eyed nooboos. Then Star shall have more kids with his lovely wife until she is too old to do so. The goal/experiment is to see how many generations I have to go to get Sunset Valley mostly full (or all full, but I doubt it) of white haired/green eyed Sims. Star will probably remarry as well down the line.
The side goal there is to have Star do
everything he can. He's maxed all available skills, completed all but two of the challenges. He's still tutoring children, though I can't seem to get it past 2.08 hours despite him tutoring his own children in skills. He's also working on the photo albums because I'm OCD like that. He's also got a lot of travelling and adventuring left to do as well. I've been playing him for a couple months now, and when I get tired of the grind, I go play a different family. I'm on my second attempt to get an Immortal Dynasty going too. Guess I should post that.
*Hugz!*
-LD