Witness testifying in Civil Suit

Dont worry.  Even if they provided money, at best they can recover the money.  For that they should have documentary proof.  They cannot get the property which is in your name now.

In case they bring any Court case, better engage a good lawyer and protect your interests.  You need not get worried or give them any answer - except saying that "As far as I know, the property was purchased by my father out of his own income".  Dont give anything to them in writing. That's all.  When any legal case comes, at that time engage a good lawyer.

Presently, simply remain cool and keep quiet.

Verbal contentions do not matter, be IT by said aunt or her husband or witnesses or by all or by anyone.

Record all threats, and remain gentle.

Approach a very able LOCAL senior counsel of unshakable repute and integrity specializing in civil matters and well versed with LOCAL applicable rules/laws and having successful track record…. and worth his/her salt ……………..and show all docs/record for a considered opinion

Check for such counsels at LOCAL Civil courts, HC.

In  the meantime check the said sale deed and find IF the said uncle, aunt were witnesses in said agreement/deed, and said witnesses have signed as mere witness seeing the executants signing the instrument (only) or your father has signed any document towards getting loan/advance from said uncle and aunt.

If the said witnesses are against you at the moment, can’t you crease the differences if any!

The witnesses may also understand eventually/later that they can be prosecuted for false representation.

For the time being you may go thru;

Indian Evidence Act;68

Registration Act; PART VII OF ENFORCING THE APPEARANCE OF EXECUTANTS AND WITNESSES, PART XII

OF REFUSAL TO REGISTER (75)

Isn't IT same matter posted by you in other thread..