Do you think that being a parent is different today from being a parent 100 years ago?
Or, previously many people had had a lot....
You are not incorrect, but you can add another had.
It sounds funny, but it would also be a correct way to say this.
I don't know. Previously many people had a lot of children, but it doesn't happen nowadays.
It is different.Parents in neuclear family have to take care of so many aspects of chiild growth,which were taken care of by other members in the families of previous century.