Can brother claim share in self acquired property ?

My father build a house at native, another house at a taluk level. The land ( at native ) is from grandparents . The site at taluk level is registered on my father’s name. My father gave full money to construct these both houses. Post this my father got retired. He constructed a house with his retirement money on a site which owned by his elder brother . Apart from this my father purchased two site with retirement money which is vacant. His elder brother has not contributed not even 5% whole property. My father is not getting any pension and amount what he got as one time amount . My uncle is getting pension . I have below questions 1. Does my uncle have any legal right to half share in all property what my father has earned? 2. As my father used his retirement money to construct the house , how much portion of the property he need to give to my uncle ?(as the site is registered on my uncle’s name ) 3. In such situation what law applies ; Please advise