I thought having eight was hard. I have no nannies though, I do it myself.
My Mother had 7, she solved the chore problem by training us all to help. My older sister was as good a mom as my mom, but more strict.
We all did dishes when old enough.
We ALL had to make our beds, clean our rooms and organize our drawers. On Saturdays, we stripped the beds and then had to remake them Saturday night. I am talking hospital corners, and Dad dropping quarters on them to see if they met specs.
There was no fighting, or running in the house. Shoes were left at the doorway, and Gramma did a lot of cooking. The oldest was my brother, who worked two different jobs and donated the income from one of them to the coffers. A tradition that followed until I moved out. The young ones, I was #3, had a much easier time, though they did take on the family paper route, they got to keep their earnings.
I try to teach my children the same thing now that they have children. They are not buying it. IMO, the worst thing you can do for humans, and that includes children, is expect nothing, and give them everything. It breeds Democrats and Communists.