It's a different world now, for better or for worse (and in many ways better). But fundamentally just different.
Looking at my own family, my father was one of five and my mother one of four. My maternal grandmother wanted more children but had repeated miscarriages. My father had an older brother who died in toddlerhood of a disease which is entirely curable nowadays.
My maternal grandmother was one of eleven surviving children. There were thirteen in total but one died as a baby and one in a tragic accident involving farm machinery when playing in the fields after school.
When my mother speaks of her "cousins", she's talking of over 30 people. It completely boggles my mind. I have five cousins. My children are unlikely to have any first cousins. Coming from a farming community, my mother's childhood was full of huge family parties in someone's barn or a church hall. Lots of dancing. The women would sort the food and the men would get drunk. Mostly, what my mother remembers from her childhood is having a lot of fun running wild and growing up in a big group. More fun in her view than people have nowadays.
But opportunities were limited, each individual child didn't get much in the way of resources and rates of alcoholism and depression were sky-high. My oldest uncle was in the police and was fairly frequently called to incidents of suicide. "Have you heard about poor William, Annie's boy? They found him in the south barn" was the sort of thing my mother heard more than once during her childhood.
You can't turn back time. The amount of resources required nowadays to give children a decent start in life would have been incomprehensible to my grandmother. Hers were lucky to have clothes and a full stomach, and had very little else. And the older ones definitely raised the younger ones - it was expected of them.