Kidnapping of child

Everyone in this system are on women supporters. Respected Sir/Madam, My wife has lost her memory completely, she is physically and mentally abnormal due to the side effect after outcome of suicide attempt(hanging herself). Now she is living with her parents. My in-laws filed a case against me u/s 498(A), case is under trail in court. All this happens in 2013. They kept My twins girl childs from 2013 to for 2017. In May 2017 they sent my childs to my custody. I admited them in prestigious school by giving huge donation. But on 28. 04.2018 they suddenly kidnaped my childs without my knowledge when I'm in off. I complained PI ACP DCP CP but they all r rejected to file fir and asked me to go to family court . But as per my knowledge and knowledge obtained from this forum, it is 100 percent cognizable. If I go to family court it will take some time to get my chins. Pl guide me wt shud I do next. 1. Pvt Complaint in court ? Or 2. Habeus corpus or 3. Put case in family court? Or all of them ? Pl guide me.