Partition

First stop worrying of threats and it may kill you mentally.   DO NOT APPREHEND OF ANY ACTION FROM YOUR NEPHEWS AS THEY ARE NOT CO SHARERS, AND IF YOU ARE IN POSSESSION SINCE 1992.  The action may be suicidal to other party as he has to shell down court fees on present market value and make several  persons who are in enjoyment of property  and without expecting any success in the case.  Grandchildren are not class 1 legal heirs.

Whether the family settlement was oral or written, registered or unregistered as you have mentioned both circumstances?

Your sisters / their legal heirs have equal right in the ancestral property devolved upon your father who is stated to have died after amendment in Hindu Succession Act, 1956.

The following was information provided by queriest

This son is me. if my sister's heirs files a partition suit, what could be a probability? I have original memorandum of partition made by father on 20/- stamp signed with 2 witnesses. on of them is expired.

The presumption is that the partition was known to all legal heirs in 1992 and that you were in possession and enjoyment with such mutation known to one and all.

DO NOT GET AGITATED, AND LET THE MATERNAL GRANDCHILDREN CHALLENGE THAT THEIR  LATE MATERNAL GRANDFATHER HAS NOT PARTITIONED THAT PROPERTY IN EQUAL SHARES IN COURT .

"2. He has 2 sons, 2 daughters and a wife.

3. He divided property in 4 parts. 1 for himself, 1 for wife and 1 each for 2 sons.

4. Nothing for daughters"
 

"2. One daughter sold her unpartitioned share in fathers property in 2017 and she died in 2018.

3. Now heirs of died daughter have objection on the partition made by father in 1992. They want equal share in father's property which was partitioned in 1992.

4. Other daughter is enjoying her share and no objection at previous partition.

5. Now all property has been sold except a son."

The facts posted are inconsistent. How the daughters could sell the property when they were not given any share at all (by the so called oral partition. 

It appears that you have not posted the complete facts.

 

Dear Om Kalse,

Once the Property got partitioned and taken possesion of their respective shares by the legal heirs in the year 1992 holds good and the same was not objection by your sisters within 3 years, and subsequently, you father expired and his share was partitioned among yourselves that also holds good. In case if the children of your deceased sister threathens you with litigation, let them go ahead because, they lose time and money for such unnecessary litigation. 

How is that the property is ancestral? If so, why the share to the wife(mother of the quetiest)? Is she still alive?