Asset and liability affidavit

How do you claim/ establish /prove that she is earning Rs. 30,000/- in cash from tuition ? 

It is not a legal query for consideration and obligation of experts on this platform.

If your father has purchased the property in your name you are the titleholder and can not conceal.

Seek advise / guidance of the lawyer engaged / paid by you who is well aware about the facts and circumstances of the case and an able, competent and intelligent enough to satisfy your queries.

Thanks a lot for advise. Regarding first point....how can I prove in court that she is earning 30k from Pvt tuition?

That income is not regular and certain.  You may state a hundred sources of income of wife but the court considers that income which is regular and certain.  Let your advocate handle the issue.  But submissions and arguments indirectly speak the real mentality and intentions of the parties, Court considers those signals to deliver justified maintenance to spouse.

You can include the information in the counter affidavit.

It is better to consult and engage a local prudent lawyer for analyses of facts, professional advise and necessary proceeding.

An affidavit must be true to the facts, you are only aware of the facts.  Disclose facts and do not seek opinions on disclosure of recorded facts.