1. If there is two complete Will and no Codicils is there then the last Will Remains in force and is to be accepted as legally a valdone.
2.So if you rely on the second one then you will get only what is mentioned there. if any proeprty is missing for whatever purpose the same can not be claimed by you unless the maker of the Will mention s that 'apart from the properties mentioned in the Will all other properties if subsequently purchased or left to be mentioned here will also go the beneficiary of the Will'.
3.If you rely on the first Will then you can not refer to the existence of the second Will.
4. For getting probate you will have to first make an application with the NOC of other legal heirs of your grand father.If they refuse to give NOC then you will have to prove the validity of Will.
Meet a local advocate to know the process of getting a Probate.