Property

My grand father was tannet to a jameendar and in the year 1993 according to tannancy act my father has paid the compancation to jameendar through court and transferred land to my father's name will it comes under self acquired property or ansister property. Before my birth my father bought my nearest relative's son (no adoption was taken legally or as per hindhu adoption practices) in age of 2 years and he has education till 10 th standerd at our home only his education records where on my father's name only as a son. but he went of to his original parents after his 10th standerd from there his marriage and every this has went on on his original parents only. He only using our sir name and fathers name .his spouse and children ware with his original parents sir name only and he is also having some identity proofs on his original father's name . Does he have any right to ask property in my father name. And my father want to share his property only to me only my father is alive now please tell me what measures to take.