I'm rather sure the chance of multiples has nothing to do with mods nor does it have anything to do with the update (1.00.05). As Moonlyght states in the above post, it's a question of luck. On 2 of my families, I've never had *any* sort of multiples. On 3 of them, (including my original family since 1.00.00) I have multiples *almost* every generation. I'd also like to note that my families are staggered as far as "new - post update" and "old - pre update".