Are the children entitled to have their father allocate to them a share in the new house's land, equivalent to the fifty thousand (currency unspecified) that resulted from investing their mother's inheritance?

If the father took 10,0 as a loan or for safekeeping, then their owners are only entitled to 10,0. However, if he took it for investment, and bought a house with it and additional money, then they are entitled to 9.52% of its value from the house.

If the father sold the house and bought land with its price without adding more money, then they are entitled to the same percentage (9.52%) of the land. Each heir owns their legal share of this percentage, and they have the right to demand that the father write down their undivided share. In case of dispute, recourse must be had to the Sharia (definition) court to decide the case.