The estate of the deceased who left behind a wife, sons, sisters and grandchildren

Praise be to Allah.

What you have to do is refer to the nearest sharee’ah court to divide the inheritance, after paying any debts that are owed and executing the will of the deceased with regard to one-third or less of the estate. Then the division of the estate among the heirs should be done after the necessary conditions have been met and there is nothing to prevent it being done. In any case, once the necessary conditions have been met and there is nothing to prevent the estate being divided, and there are no other heirs apart from these: 

-The wife should take one-eighth (1/8), because there are offspring who are entitled to inherit.

-The father should take one-sixth (1/6), because there are male offspring who are entitled to inherit.

-The mother should take one sixth (1/6) because there are offspring who are entitled to inherit

-The remaining children should take equal shares, so long as they are all male. But the grandchildren and sisters doe not receive any share, because there are offspring who are entitled to inherit, and these are the sons.