What is the mother's legal share of the estate of her daughter who died in an accident, for which her father filed a lawsuit through a lawyer?

The mother's share of her daughter's inheritance is a fixed obligation that is not affected by the father's marriage or divorce. If the deceased daughter has siblings, the mother's share is one-sixth according to the majority of scholars, based on the Almighty's saying: "But if he has brothers, then for his mother is one-sixth." However, Sheikh al-Islam and Ibn Sa'di chose that siblings do not reduce the mother's share from one-third to one-sixth unless they are heirs. Accordingly, the mother's inheritance would be one-third if the siblings are not heirs.