Is the father obligated to restore the inheritance rights of previous generations, in cases where his daughter did not inherit from her grandfather due to the prevailing custom in their region that a daughter does not inherit from her father, especially if some demand it?

Depriving females of inheritance is a pre-Islamic, invalid custom that contradicts Islamic law. Rights must be returned to their rightful owners, unless they willingly relinquish them. In this case, the son and daughter inherit, with the male receiving the share of two females. The full brother is excluded from inheritance due to the presence of the son.