No Partition Deed b/w 2 Brothers from Since 1983.

My Grandfather sold his property and purchased new property in the year 1975, and that new property shared equally to their 2 sons (each 10 acres). After that my Father and Uncle both got separated in 1983 Virtually, before that both the brothers sold their own property after their Father’s death (Uncle’s 10 Acres and My Father 10 Acres) and shared their amount equally in the year 1984 and have been living separately in different places since then. and by that time there was no partition deed/compromise doc was made between them. After my father marriage in the year 1983, he came as Illarikam's son-in-law (a bridegroom going to the bride's family and living permanently with them (Matrilocality)), because my Mother didn't have Brother. and My Mother Dad gave his own property to my Dad through Will in the year 2010 and he was passed away, and in which he mentioned very clearly saying my son in-law is Matrilocality since their marriage and he is the sole caretaker of me and my family with all the support. After my Father's marriage, my Father purchased all his property on his own. Now My Dad owns good property, compared to his brother.. So far My Uncle and Father have had very good bonding, and Recently my Grandmother passed away, and after that my Uncle was against us and asking to share in my Dad’s property. Can he(Uncle) be challange in court? If so, will it stand in Court!? If So… then how can the court deal with this!!! Will my father's property divide equally? If so, how can we challenge this!!!? Pls HELP ME and give me the right direction and suggestion to proceed with this further. Thanks a lot.