Mere physical presence matters hugely, and your family, going back two generations, had only two children. One of whom had no children. The other one had maybe one. That one had none.

Those smiling Fifties pictures with the sensibly reduced family are the source of that. Two or three children instead of the normal four or five.

I personally have only known only one family that was not religious that had more than two. They had three. The religious have between five and eight and think nothing of it. Everyone else I have ever known had two or one. Or none.

That's your answer. The squeaky wheel gets the grease, and there is nothing silenter than someone who is not there.