Hi Mary,
All of the questions about dependant children etc relate to whether your husband can support you without recourse to public funds. You must tell them about any children that he is responsible for supporting, whether they live with him or not. If he pays child support for any child/children and how much he pays is seen as outgoings from his earnings, as is his rent/mortgage, utility bills etc.
They only need to establish that after he has paid all of these outgoings, he still has enough money left over to support a wife as well, without claiming any kind of support or benefits from the government.
Iain.