Am I entitled to claim my wife's share of her mother's inheritance, which has remained undistributed for 30 years since her passing? Should the deferred mahr (dowry) and gold be valued at their worth 30 years ago or at their current value? And is it permissible for me to remind my father-in-law of his grandchildren's right to the compulsory bequest?

You are entitled to claim your share and your children's share of your wife's inheritance and what she inherited. Your right does not lapse with the passage of time unless you voluntarily relinquish it. Everyone must disburse the share of minor children from the inheritance, and adults may relinquish their share. The deferred dowry is a debt owed by the husband unless the adult heirs relinquish it, and it must be paid according to the agreed-upon specifications. If the currency exists, it should be paid even if its value has decreased. If it no longer exists, it should be paid at its value on the day it ceased to be in circulation. A bequest to grandchildren from the daughter's side is not obligatory, but a bequest to them is permissible if the grandmother bequeathed something, and it is recommended that they be provided for from the inheritance when it is divided. It is advisable to consult the Sharia courts regarding inheritance matters due to their sensitivity and gravity.