Now you have come out with full details. Why you failed to do so in your first post? Probably you (like other querists here) thought that with half information, which according to you is sufficient for the query, you can get the answer. BUT ALWAYS REMEMBER, UNLESS YOU COME OUT WITH COMPLETE FACTS, you will never get a complete answer. Half facts will fetch you only half answer.
Now from the facts revealed by you, I can say with certainty that it is an Ancestral property in the hands of your grandfather.
Since no partition of the property had taken place upto the death of your grandfather in the year 2015, all his daughters are also co-parceners with equal rights as the sons in the family.
Your grandfather could not have WILLed the entire property in favour of his three sons.
At best, he could have WILLed only his share in the property, in the way in which he want.
Now the clear position in view of the prevailing law on the matter is that - the entire ancestral property has to be divided into 8 equal parts - and 1/8th share going to your grand father, 1/8th share to your grandmother, and 1/8th share each to all the sons and all the daughters.
The 1/8th share that had gone to the grandfather, will be governed by the WILL which he made in favour of the three sons. Therefore, the 1/8th share falling to the Grandfather, will be equally divided in 1/24 share between the three sons.
Thus, the three sons will get 1/8+1/24 = 4/24 or 1/6th share each, and the each of the daughters will get 1/8th share each. Your grandmother will get 1/8th share.
For this, you have to approach the Civil Court and fight. Only then the daughters will get their share.