1. You should first of all understand the meaning of ancestral proeprty.
Also, the daughters are not entitled to a share in the ancestral property if they were married before the latest amendment came into force in the year 2005.
Thus in my opinion, there was no need for this release deed at all even if you were in possession of ancestral property if all your daughters were married.
Further if the release deed was executed by a registered document, and it has not been contested or objected within three years from the date of its execution, they cannot agitate on it at this stage and also since they have clearly acknowledged the receipt of a sum of Rs. 50,000/- they cannot dispute it now and cannot make a claim on it is this stage that too after a period of three years, because it is barred by limitation even if they have not got that amount at that time.
Firstly you discuss the details at length with your advocate because your daughter who has filed the partition suit is not entitled to any right in the proeprty now under your possession during your lifetime even if you have any portion described as ancestral property.
2. You may first analyse the facts based on my above opinion, once it is ascertained then you can dictate terms or even refuse to pay them any and ask her to approach court,because any such claim will not be maintainable if they approach court.
3. Dont do any such mistake because they will be locked in horns after that
4. No, not at this stage, see my anser in the 1 above.
5. No such agreement is valid.
6. In my opinion dont enter into any agreement at this stage because no agreement in this regard will be valid, it may be for your satisfaction alone.
7. You may enquire it locally.
8. Legally you are not bound by any such commitment hence you refuse ton pay any amount to them.
9. Hence you may discuss with your advocate about the modalities.
10. He will be in problem after that.
11. you may decide
12. It will certainly cause problem to the ensuing partition suit and it may become fatal to your defence.