Problem in land seperation between brothers

Myself jashva from Chennai hindu falimy. my grandfather have five piece of land he already passed away in 1980 after his death. 2000 year His 3 sons the 5 piece of land needs to be separated between 3 sons. It has been written statement in the stamp paper.so the first three piece of land consists of 9 cents of land. It has been divided into the 3 cents each. Middle 3 cent construction house worth of 1.5 lakhs. Son 1 and 3 seperatly went away from house so son 2 need to repay 50 k each to his younger and elder brother. he does not have the money so he given the additional 4th piece of land to his younger brother and paid 50 k to elder brother and elder brother also having additional land ( 5th piece of land). All conversations written in stamp paper with sign. 2010 Son 1 sold the 3 cent and 5 the piece of land. Staying in rent house. Son 3 sold 4 the piece of land and purchase new property and constructed house and holding 3 cent land also. Son 2 ( My father) holding 3 cents land with house. That house is fully damaged due to water lekage and broke of top wall. Suffering a lot. 2019 son 2 asking son 1 to change electricity bill name from son 1 to son 2 for Registeration of the land. Son 1 again asking share from son 2 and 3 due he don't have asset now. Is this acceptable.