What will happen if relocation before divorce with child?

You don't provide enough information to properly answer your question, but generally, Florida has a relocation statute which must be strictly adhered to, or the child/children could be ordered returned to the original county in which they lived and to the custody of the non-relocating parent. Consult with an attorney to discuss the specifics of your situation and your options.

An order can be entered that requires you to return the child.