It is too late, if you would have consulted any local lawyer he would have guided you. If the amount is not yet disbursed then go to Civil Court by filing suit and it will be devided into three parts and each one get 1/3 rd share, provided you are also nominees. Instead of asking somebody go through relevant sites as follows and educate yourself.
(Rules 50 of the AP RPR Rules, 1980)
Family Pension is payable to the family of a Government servant who dies while in service or after retirement.
Family for the purpose of Family Pension means
Category - I
Wife / husband
Sons/unmarried daughters including widowed/divorced daughters up to the date of his/her marriage/remarriage or till the date he/she starts earning or till the age of 25 years, whichever is the earliest
Sons/daughters who are physically/mentally disabled throughout their life subject to certain conditions
Category - II
Unmarried/widowed/divorced daughters and parents who were totally dependent on the Government servant while he was alive where the deceased employee left behind neither widow nor child. When unmarried/widowed/divorced daughters and parents are alive the family pension shall be paid first to the widowed/divorced daughters and then to the parents. Father precedes mother
Note: Category II members are eligible only after exhausting all members in Category I.
Except in the case of widow /widower the grant of family pension is subject to ceiling of income of Rs.3350/- per month.
Where the children of the deceased earn not less than Rs.3350/p.m. or where the parents were not wholly dependant on the Government servant, no family pension is payable.
Family pension is normally payable only to one person at a time.
No nomination facility is available for family pension
If the son or daughter is suffering from any disorder or disability of mind or physically crippled or disabled so as to render him unable to earn a living even after the attaining the age of 21 years, family pension is payable for life subject to certain conditions.
Calculation of Family Pension - Family pension is calculated at two rates:
Enhanced Rate - Enhanced Rate of Family Pension is calculated at 50% of emoluments last drawn and in case of death after retirement, it is restricted to the pension admitted to the individual. The enhanced rate of family pension is payable for a maximum period of 7 years and not beyond the notional date on which the deceased would have attained the age of 65 years (Applicable only if service rendered is not less than 7 years)
Normal Rate -- Normal Rate of Family Pension is calculated at 30% of the Emoluments last drawn. Family Pension resulting in a fraction when calculated, is rounded off to the next higher rupee.