Mr XYZ bought a land in 1970 and Mr XYZ is died on 2015 and his 4 sons (Mr A,Mr B, Mr C, Mr D) became owner jointly on that land because partition deed is not done
In 2022 June, they have sold that land to Mr EFG, sale deed also done and money is given equally to 4 sons
After 2 months Mr C found a original "Will " of his father Mr XYZ in this Will it stated that whole land should be transferred to Mr C after his death because he has taken care of his father till death
Since Mr C got a "Will "can he claim money from Mr A , Mr B , Mr D of that land and he don't want bring Mr EFG in this matter because he has good relation with him
So this Claim with help of Will is valid ?
Can he claim full amount of that land ?
Please give your suggestions on this above matter