Okay, here's what I'm trying in my new game. My 6 adults are Dick & Jane, Bob & Carol, Ted & Alice. The young one I named after my maiden great-aunt Nora and I'm going to try and leave her childless to see if she lives longer. Each couple has had one baby and I added the parents initials to the child's name to tell who's who. I'm planning to have each woman have 3 babies - 1 by each of the men - to minimize inbreeding - just like the Benleuti & the clones on StarTrek Next Gen.
I've even gone so far as to download free family tree software from Legacy - how pathetic am I? I'll let you know how my "planned community" works out.

Dar