1) when did your father die?
2) is will attested by 2 witnesses ?
3) has any probate been applied of will ?
4) the contents of will have to be perused
5) were you informed of will on father demise ?
6) if you were not aware of will and contents not disclosed to all sons on father demise it is suspicious circumstances surrounding will
7) In any case partition suit proceedings would be stayed and your mother will have to prove the will
8) your mother has only life interest In property
And she cannot bequeath entire property to only 2 sons