Nothing. usually it should resolve the issues between you and your wife but I guess It is simply extortion center and everyone get their share.If you agree your wife's terms (giving money/taking your wife back ) then complaint will be withdrawn. If you do not agree , the complaint become FIR and all the accused will be arrested and pressuried .
Incase FIR is already registered, it may be withdrwan if the case is compondable in your state if you agree to your inlaws/wife, otherwise arrests.
Get the AB for accused beased on complaint/FIR immediately . Touch base with SIF chapters in your local area.
Do not trap in the extortion , fight the cases and go or quashes depend on the allegations in FIR or wait till chargesheeted and apply for quash based on chargesheet.