ohh psychopixi you are soooo close. Solution to come after I'm done with my classes today.. so in maybe 7-8 hours? Haha, soo close psychopixi. You're definitely on the right track, but the 16 (2nd generation) will not produce 64 children. I think you're just trying to turn it into a simple equation, which it's not that simple. Go back and check some of your pairings with the 2nd generation. Remember, if Jack mates with Jill, then you have to make sure Jill's dad, mom, aunts, uncles, grandparents, great grandparents, great great etc. are not tied to Jack's side of the family at all.