No demarcation line over property father asking balance of land

I have a residential building gifted by my mother in 2006 ( area 5 satak ) & there was a land ( 2.5 satak) in the name of my father(adjusent to my land & building). There was no demarkation line between above mentioned building & land of my father.in 2013 my father sold the land to mr. X( 2.5 satak ) after giving boundary wall. Mr. X sold the land (2.27 satak )( as per sale deed) to mr. Y in 2014.now my father is claiming the balance of land ( i.e. 2.50 - 2.27 = 0.23 satak ) after the boundary wall i.e. FROM my portion of land & building. There is no record found in BLRO AND MUNICIPALY RECORD