How is the remaining house from the inheritance divided among the heirs of the original deceased, after the death of his mother and four of his sisters who were among the original heirs? And do the children of the deceased sisters have a share in this house and in the share of their grandmother (their mothers' mother)?

The house is to be divided among all heirs (the mother and the seven sisters) as if they were alive. Then, each living sister takes her share, and the heirs of the deceased sisters take their share. After that, the share of the deceased mother is divided among her legal heirs (her living daughters and the deceased daughters who died after the mother). However, if some daughters died before the mother, the mother's inheritance is divided only among her living daughters. It is advisable to present the matter to a Sharia court for a legal distribution.