Request for UK dependent visa applications?

I fill out the UK visa form for family visits. In the form, they asked questions about the dependent details [Does anyone rely on you for financial support?
Include both those travelling with you and those who are not.]
Does a dependent also mean the children or the spouse? If the wife is a housewife, should she be considered a dependent or not?
The other question is whether the child lives with his parent but does his own job, does he consider himself dependent or not?