1) how to claim the amount
Where ever there is a valid nomination in your name, you submit an application along with the death certificate of your mother and submit the claim forms, get the money, let your brother in law object, ask him to go to the court to claim his share by proving his entitlement.
2)how to claim the jewellery and other fd ( without nomination)
For jewels and other FDs where there is no nomination, you can obtain a succession certificate by filing a succession case through a competent court of law and you can mention the FDs as well as the jewels worth in the petition, get the certificate from the court and apply for retrieving the movable assets.