I've been playing the same hood since the base game and there are definitely stretches where I'll have a ton of twin births in a row, I think three or four once. Now that they're synched I can't look back at the list and pick out the trend so easily, since some were so far ahead, but it was a definite trend. I also have one family in which the kids are twins with an older single sibling, their father's a twin with an older single sibling, and HIS father was the same. I'll be disappointed when that trend ends, as it must