1) Since I want to buy the land in Karnataka only, I understand using the Paani, I have to get one certificated done . What is that certificate name and where and now to get it done.
As per KLR at, you have to get approval from DC based on the recommendation of Tahsildar on such agriculture lands
2) Since the panni is in my fathers name, I will also need a family tree. Will an affidavit family tree be sufficient or should I get one from the Tashildar.
An affidavit for family tree and also the pahani will help you to sail through smoothly.
3) The property I am interested in buying is in the name of the daughter and the son, they inherited this property from their mother. Mother got it from father in law, once the husband died. I can see this in the RTC. In such cases, is it right that there will be no mother deed ?
There is no question of non-availability of mother deed, you have to insist on the same in the name of any original owner and the details of the subsequent purchasers.
4) This land has been barren and nothing has been cultivated on it for last 10 years, in such case Can you please specify the names of some basic documents that I have to ask them, before I go formally to an advocate for legal opinion like RTC, EC etc…
The documents to be verified shall be notified by your advocate, you may consult him on this.
5) If all goes well , at the time of registration, is it compulsory for a Lawyer to be present for registering the property in my name.
not necessary