1. The name reflecting in patta or other relevant revenue record does not establish title.
2. The law of succession depends on the law of the land or on the terms of the Will, if there is an.
3. if you want to enforce your share as per terms of the Will then getting Probate of Will is only option. It indeeds take time and hence you need to show patience.
4. Another option is to make amicable settlement and be ready of get share which all of you mutually agree.This option is strongly recommended.