Hi
Try to negotiate a talk with her if you really wants her back.t ry through relatives or common friends to have a talk to convince her not to spoil your child's life.you too speak to her ,if marriage can be saved by making this initiative do that .
Most marriage have problem ,but in-laws minus a marriage is not practical if both parties are not agreeable to that idea.so tell your wife that you can't abandon your parents and you will not leave them.she should make her own small family with the big family of her -in laws.
Law provide a right to have a separate accomodation if a wife chose to, but it is also there a husband can't be forced to leave his parents to provide wife a separate accomodation
So adjustment.from both the sides I.e, your wife and your parents is needed to have a happy domesticity.
Taking any legal steps will spoil the relationship,so handle it wisely.take a legal step when you feel your interests are infringed and threat to you and family consisting your parents.
If your wife is very stubborn, move to court with an RCR asking her to return
If you make up your mind for a divorce then file a divorce seeking custody of your son.
Wife is entitled for maintenance if she is not earning.
Once both parties agree for a divorce ,a joint petition can be filed or after initaing a divorce from you the same can be settled and convert into a Mutually consent divorce.such situation alimony /maintence and custody of your son càn be decided Mutually.