Klara had 6 kids, but just Adolf and his little sister Paula survived childhood. Her first child Gustav was born 1885 and died 1887 because of diptheria (2 years) Ida was born 1886 and died 1888...
Personally, I don't think their is a "magic number" when you suddenly have too many children. It all depends on the family, community and the amount of money that is available for the parents' use. I...