Twins and Triplets

OMgosh my current main save has been full of multiples too! The very first pregnancy was twins, and I wonder if having multiples makes it more likely to have multiples later on? Like, it runs in the family or something? I can't imagine the Sims is that sophisticated, but so far I've had twins, then triplets and twins, then three sets of twins and two sets of triplets, and now in my current generation I've already had another set of twins. I've had eight single births as well, many more in the later generations so maybe it's slowing down. Still, that means out of 17 pregnancies, 9 have bean multiples. That's over 50% which seems...not right, lol.

I don't mind having multiples, but it seems like that should be a rare occurrence. In real life, likelyhood of twins is only 1 in a hundred, and triplets is closer to 1 in a thousand. I don't mind upping that--maybe 1 in ten, or twenty, for twins, and 1 in fifty or a hundred for triplets--but what's happening now seems WAY above that.