What can be done to get hands on your husband?
1. You need to file missing complaint with police. Police wont take complaint, but you need to manage.
2. Hire services of detective agencies.
Its not a tough job to find out where he is.
You have not filed any 125 crpc or IA application as I see no mention of it.
Donno under what sections u have asked relief under DV, as that only can get you maintenance for u and the kid.
So you need to tell what sections has been filed under DV.
Now after filing of 125 crpc, court will see whether he turns up or not, if not the case will go exparte
and execution orders be passed and the said flat will be seized and you will be given posseions of it and thereafter you can sell the flat and use the money.
MIL is no way related to maintenance.
You can ask money from husband and not MIL and FIL.
You are BA pass, so if your husband contests any of the maintnance cases, you wont be entittled to any maintneance, as you are educated healthy woman.
My advice is hire services of private detective.
and file maintenance application ASAP.
and try finding a job too, self respect is something else which not all have, hope you understand what I mean.