Thanks, that is helpful to know. Although they would then not be able to have offspring from anyone in the town, if it was a town of clones.
But what I am also wondering is, if I place Billie Bob and Susie Q in a town and then break them up and Jane Doe marries Billie Bob, will it still show that he is Susie Q's partner or that he is now Jane Doe's partner?
And if Susie Q married Jonny B, will thier offspring see the offspring from Jane and Bille as being related, a step sibling?
I am figuring that it will show him as Jane Doe's partner, but I had moved a sim to another game in the same town, hoping to marry a sim to another sim. They had been related in the original town as grandfather and grandaughter, and the system showed them as being related in the new town, so I couldn't match them up, which surprised me.
I know it was because they were related in the original game; but I am just being more cautious in other testings.
I hope I am making sense.