Can Daughter And Son Claim Their Father's Ancestral Property In Year 2016

I am purchasing a biaapa approved dc converted residential property in Bangalore. The land of 1.5 acres on which this layout is made, was sold by one Mr. Ganesha to Mr. Biddappa in the year 1987 through registered sale deed. Then Mr. Biddappa sold the same land to Mr. Reddy in the year 2006, Then Mr. Reddy sold the land to Mr. Jain in the year 2008, Then Mr. Jain sold the land to Mr. Siddarth Gowda in the year 2010, then Mr. Siddarth Gowda sold the land to Mr. Kumar in the year 2016 and developed it into the residential layout in 2016 with all approvals. Now the daughter and son of Mr. Ganesha who sold in 1987 filed a case demanding their land share after 29 long years i.e in 2016. (1987-2016=29 years,5 sale transactions ) delay. Daughter is now 45 years of age and son is 41 years now while they filed the case. Is this case valid and can they claim their rights now after 29 years of sale and after so many same transactions happened from 1987 to 2016. Now the land is fully developed into an approved layout.