They divided their father’s estate apart from one house; how should it be divided, when some of them have died and others are still alive?
Question

                A man died and left behind an estate, and his estate was divided among his mother and seven full sisters (who were the only heirs). The entire estate was divided among them, except for one house that remains.

The first question is: how is this house to be shared out? Please note that his mother died, and four of his sisters also died after their mother. Are the children of the sisters who died entitled to any share in this house or not? Are they also entitled to a share of their mothers’ mother’s share?
Praise be to Allah.
      This house is to be divided as follows: 

    Firstly: 

    The house is to be divided among all the heirs, namely the mother and the 
    seven sisters, just as if they were all still alive. 

    Secondly: 

    Each of the daughters who are still alive should take their share of the 
    house. As for the sisters who have died, their shares are to be taken by 
    their heirs as prescribed in sharee‘ah, such as their children and others. 

    Thirdly: 

    After that, there remains the deceased mother’s share of the house. This is 
    to be divided among her heirs as prescribed in sharee‘ah, namely all her 
    daughters, both living and dead, if she died before her daughters. However, 
    if some of the daughters died before the mother, the mother’s estate is to 
    be divided among those who were still alive (at the time of the mother’s 
    death). 

    However we advise you to refer this matter to the nearest Islamic court, so 
    that the court may examine the matter and divide the estate among you 
    according to shareeah. 

    And Allah knows best.