--A Will is the expression of the testator's wishes concerning how his/her property is to be distributed.
--It is the only way one can ensure his/her assets will be distributed according to his/her wishes after his/her death. --It should be in written, however it may be either handwritten, or printed, or typed.
--The testator must sign at the end of the Will.
--It must be witnessed by at least two persons present at the time of signing by the testator. The said two persons ,who witnessed, must acknowledge they were present and must sign the Will as witnesses in presence of the testator.
--Making of a Will is the only remedy to be sure that asset of testator go to the persons he/she loves.
-- Registration of a WILL is not necessary in out country.
Hence, if there is a WILL executed by your grand father , it is very difficult to know the availability of the same, Until one of the LRS started file any suit in the court ,because till date no body of your family discuss upon this matter.
Your father is also not interested to ask for the same from his brothers.
So, for the sake of future dispute among the family members , your father should ask his beloved for the WILL or other documents , if any hold by them.
Firstly,he should send a legal notice to his brothers to Partition the whole property and in this way the reality will came into light.
After getting the notice , they can make a Family settlement deed and can registered from the Registrar and that deed has legal value .
Otherwise, if there is silent and no response then in that eventuality ,your father should file a Partition suit for the whole property and thereby ask his share.
During the suit period , there may be settlement among the brothers as per their wish in the court as well.
If, two already died , then their legal heirs will have right for the share of his father.