Hi Nina,
What sex are the children and what type of visa do you hold? If the children are boy and girl and if even just one of them is over a certain age, they will require that you have enough bedrooms in the property you live in to allow for a bedroom for each of the children. The other main requirement will be that your husband has adequate income to support a family of four without recourse to public funds. It could be details like this that are holding things up.
Iain.
