1. Engage a tax consultant to get his IT returns information.
2. File a case before the consumer forum for disbursing the whole amount in favour of other legal heirs depriving others.
3. File a case u/s 498A, 406 IPC as well as under PWDV Act to get back your streedhan and other shares in property.
4. You can file suit for partition as well if your husband has left any immovable assets.