My father had taken some money from me to invest in a land as he was running short of funds. There is no record of the money I gave to him since it was given in cash. The sale deed includes names of my father and myself addressed as the "buyer". In the revenue records of the government the land is in joint names. There is no other document of joint ownership.
Will the law treat this as "joint tenancy". Can I assume that I as the surviving co-owner in case of my father's demise will have full rights over the land (I do have brothers and sisters).