Mr Chetan
Problems in marital relationship can be for various reasons.
In the case referred by you, the couple lived together for hardly 3 months.
You said the wife regularly fell ill. It may be various reasons best known to the parties. If it is due to any incurable disease and the marriage has been performed concealing such fact incurable disease, then that can be a valid ground for divorce.
You also stated that the husband sent the wife to her parents hous. But you have not stated the reason for that.
You have also stated that the husband recieved a legal notice from his wife asking for maintenance alleging cruelty. It is not clear when the notice was recieved and if any conciliator talks have taken place between the two families before and after recieving the notice after August 27 on which date the wife was sent to her parents home.
Issues relating to family matters are very delicate in nature which need to be handled with caution and care as the future of many persons in both families are of concern apart from the husband and wife themselves.