How to get title of house registered in my name

sir, i PARAMJIT had purchased a lease hold house at chandigharh it is still lease hold. i had purchased it through agreement to sell from a person SUNIL. also SUNIL had purchased it from RAJ through registered will and SPA. RAJ died after i Paramjit bought it. Sunil died after RAJ. registration of such houses is allowed now adays can i get house registered in my name through legal process. can it be through sec 53A transfer of property act. can it be through declaratory suit for adverse poseson. please note: SUNIL had sold house before death of RAJ, SPA by RAJ says that SUNIL can sell the house by taking consideration amount but RAJ is now dead.