Mutation of property

My father owned a property who is now deceased. He left a registered will declaring that after the death of his wife the surviving 3 months will have equal rights. Now the mother is also dead. One of the surviving 3 brothers has received a sum of Rs 4,00,000 on a written document which is not registered and is dated march2001. It is written in that paper that since mother is living hence property is valued at Rs 16,00,000 and to retain the share of mother 4 equal shares will be there @ 400000 each and one brother received 400000 and it is mentioned in the written unregistered document that 4 share of mother will be decided later on alongwith ther assets if any. Now mother is also dead. The two brothers are now trying to get mutation of property in to names and leaving the 3rd brother., and also refusing to pay share of mother to be divided by each brother in equal proportion. The property is 276 q yards mother shares 92 sq yards hence 92 sq yards to be devided by brothers but two brothers are illegally getting mutation in their own name. Please guide how to restrict mutation. or will mutation authorities will do mutation without getting signatures of all legal heirs and no objection from 3rd brother and also what about two sisters. In registered will it is written that daughters of deceased father will not have any right over this property., but according to HINDU succession ACT daughters can also claim their right. whether mutation official will ignore their right also.