I think it could be! Or maybe the game just likes spontaneously giving families twins like no tomorrow after giving them a set. :/
My first set of triplets were two girls and a boy; The two girls could pass as twins since they rolled the exact same things from their parents.
They both got married to some guy, and both had twins with their guys--But they were fraternal. The first pair from the eldest were girls, and the second pair from my middle child was a boy and a girl.
Second pair's girl got married and had a pair of boy/girl twins as well.
Their brother had only one daughter and she hates kids lmao RIP :sob:
Those were my longest chain of consecutive multiples, and the current twins I'm waiting on are still kids. Most of the time I have single births on the families I play versus townies, which seem to really love having twins or triplets.