1) contact a local lawyer and file detailed reply to petition
2) since wife is working and earning Rs 60000 a month she is not entitled to maintenance . i presume there is not wide disparity in your income
3) wife is entitled to right to stay in her matrimonial home
4) as far as custody of children is concerned seek joint custody of child
5) you cannot remove your wife name from society records as she is joint co owner of flat
6) you can file declaratory suit that you are absolute owner of flat as full consideration has been paid by you