Some questions
1) Is the house in which you both (u and ur mom) living given by your father or is your mother's self aquired or mother's father's property?
2) When you go to court, you also have to declare that you are earnig so and so and judge may infer that since you are earning and living with her , you are also responsible for her maintenance.
3) This is a long process in which first you will have to proove your father's income and that your mother (alone) is not able to maintentain her expenses in 22000.
4) Your father may come up with a statement that he is not earning so and so and he has liabilities like loan, medical expenses etc. etc. so and so and that since you are a major son you are responsible for their well being.
5) If father is smart, he may also file a case of maintenance on you since you are a major and earning son.
6) Even after a long battle you may suceed to increase maintenance by 2-5 thousands but judgement may also order you to pay some part to your mother............in this case if you get married and your wife objects they you will be in a mess.
7) Listen don't though stones in peaceful waters, an amount of 22000 which he is giving may also get stopped since both of them are living separately without any domestic violence by MUTUAL CONSENT and crpc 125 doesn't provide any remedy to wife living separately by her own wish.
8) Again 22000 is more than enough as per my understanding in any city of india if you have your own home and you don't have medical expenses more than 10 k per month which is not there in you narration.
Finally, would advice you to consult your father gently and ask him for more money, if he agrees then fine otherwise by working hard and supporting your own mother you are not doing social work or charity !
