Can anyone claim right in property if the will is unregistered

we are a hindu family, my father passed away in 2015 leaving 2 daughters, one son(me) and wife ( my mother), we are not in talking terms with one of sisters(eldest) rest are together as a family, my father left with an unregistered will, benificiary are me and my mother, does my sister (whose not talking to us) have any right on my father's property now ? also, how can i have complete ownership of the property which he left for me and similarly how can my mother have complete ownership of the property left for her do we need my sister ( whose not talking to us ) in getting the ownership of the 2 properties or can it be done without her