Praise be to
Allah.
Firstly:
If the grandfather gave wealth to some
of his daughters because they were in need of it, either because of poverty,
sickness or some other reason that dictated that they be singled out for that,
there is no blame on him for that and he does not have to give to the rest of
his children except in the case of need.
See the answer to question no. 36872
Secondly:
If a father dies and leaves behind a son
and six daughters, and there is no heir apart from them, then the son gets
double the share of each daughter, because Allah, may He be exalted, says
(interpretation of the meaning):
“to the male, a
portion equal to that of two females”
[an-Nisa’ 4:11].
If the price of the land is 1000 rupees,
then your father gets 250 rupees and each of his sisters gets 125 rupees.
This is how everything that was left
behind by the grandfather after he died should be divided: the house in which
he used to live, and in which your father is living and taking care of its
maintenance, and everything else he left behind of money, property and land.
The basic principle is that the estate
should be divided immediately after the death of the owner of the wealth, because
delaying it may come under the heading of neglecting some people’s rights or
lead to rights being withheld from some.
But if your father had made an agreement
with his sisters to sell the house in the future, with their willing consent,
there is nothing wrong with that.
See the answer to question no. 4089 and 97842
And Allah knows best.