The kids were way too young!
Seriously, if they got married, say 1948 or so, those kids would have most likely been born between 1950-1960, at the very very latest 1965 making the youngest maybe close to 40 and the oldest could be upwards around 55. However we see their kids and they all look like they're in their 30s at the oldest, maybe even late 20s, with little toddlers? I just thought that was a real stretch of the imagination.
When a cold momma gets hot, boy how she sizzles!