Need help to find the pension amount my father receives.

My father is a retired police officer under Jharkhand government and he hides how much pension he receives. He never told us about his salary during his job. He has a habit of giving money to his brother and nephews while we struggle for money. There have been so many instances when we have caught him doing it. Can anyone help me find how much pension he receives. He served as a Sub-Inspector under Jharkhand Police from 1994-2018. He served in the GRP in the last 5 years of his job. Any help is appreciated.