Will on notary

Mere grandfather ne 1984 me Ek shop (funds given by my father) purchase ki thi. Aur property ka 1/2 part mere father ko verbally saperate de diya(on behalf of funds provided by my father). Mere grandfather ne mere pitaji k expire (1992) hone k baad 1995 me Ek notary Ki.. Jisme unhone apni Sirf Ek property(shop)ka 1/2hamari mata(included children) k naam ki.. Aur 1997 me dada ji expire Ho gye .. Us shop par mere pitaji 1984 se saperate buisness kar rhe the.. Unke baad hum logo ne nabaalig se baalig hone tak(2019) aur Aaj tak buisness kar rhe h... 1995 ki notary me dadaji ne Baaki kisi bhi property me(moovable aur immovable property se koi bhi share nhi milega) se share ko khatam kar diya tha... From 1984 , After the death of dadaji(1997) till 2018 koi bhi case aur partition se related to our portion (1/2 shop) civil dayar nhi huyi.. But 2019 me mere chacha k bete ne (chacha bhi expire Ho gye Ho)meri mataji( including children) k khilaaf Ek civil case file kiya h. Aur shop k 1/2 me bhi partition Ki maang ki h. Mere father se lekar(1984) Aaj tak hum us 1/2 me regular kabze me h aur buisness kar rhe h... We have all govt documents ( registration of sale tax,Electicity bill, labour registration) related to buisness and will(notary form) of grandfather . So plz give guidance and validation of notarize will of grandfather.