Share in joint account

Hi, I am living separately from husband since Oct'08 and taking care of son who turned 18 in Jul'13. I am working but it is very difficult to survive as the son is doing B.Tech. We are surviving on bare minimum things as husband doesn't pay anything. He paid Rs 4500/- for the maintenance of son till he turned 18 then stopped. This money couldn't even cover his school expenses or coaching fee. Husband is working with Central Govt. I had few joint accounts, FDR's with husband. After separation he got closed one joint locker by forging my signature after which i got all joint accounts put on hold. Now he has gone to the court asking for these a/c's to be made operational, claiming that it was his money and he should get it back. I just want to know that can I claim any share in this money? He had forged my sign in 2009. Can I file a case against him in this case? Is there any provision for asking maintenance for son till he completes his studies. Please help