None of your business!
Agreed. I didn't fill in the bit about children because the only option for not having them are "don't have, don't want" Or "none yet". The first is a rude sort of response that I would never make and since my window of opportunity has passed, the second is not appropriate. What's wrong with a simple "none" for a response? I'm sure it's the owner's idea of humour but I find it rude and I'm sure others find it offensive. There are a great many people who desperately want children but are unable to have them so neither response is appropriate.
I also haven't filled in the income portion because while I don't want to reveal my income, I think it's unnecessary, the only response available to me is a rude one that I simply would not make in real life. Therefore I have left it blank.