This is strange?

[Cassie]

I'm not sure I'm going to be very helptful, but about the children looking the same - have the parent Sims got a different enough genetic makeup to make siblings with different genetics available? When I had not been playing TS2 long, I used to make my Sims look the same, and therefore the children looked the sme, except once or twice one would have eyebrows higher the other, if that. So yes, if the parent Sims have similar genes, the kids are probably going to be the spitting image of each other. If they don't, I really can't begin to put my finger on why they all look the same, that's really odd!

As for the personality point for Niceness, I'm kind of leaning toward the same explanation because the same thing happened to me. Have the parents got similar personalities? Do you make your Sims with the same personality a lot? Because that would explain that, but obviously this is probably not the case with you, and once again, that's really odd. :-\

Sorry I cannot be much help but I'm sure somebody will reply soon with a much more detailed and elaborate answer as to why this has happened to you. People here are genuis like that.