You have stated that your father transferred his property to you by gift deed, power of attorney deed and will.
What was the necessity to do three kinds of transfer.
Please be aware that the power of attorney deed will not confer title to you.
The will shall become enforceable only after the lifetime of your father, that too if the other heirs object then you may have to file a probate petition before a competent court to get grant of probate of the will to make it valid.
Thus the registered gift deed shall only be the legal solution to this problem.
Once a registered gift is executed in your favor, it cannot be revoked even by the donor.
But the donor should have marketable title over the property he desires to transfer it vide a registered gift deed.
Once a gift deed is done in your favor, you can transfer the revenue records and all other records in your name indicating that you have taken possession of the property accepting the gift deed made in your favor.
This shall forbid your sisters to file any case against you and even if they file it may not be maintainable in law.