1) title to land is not clear and marketable

2) file suit against Bhusan on basis of indemnity clause in the sale deed and seek refund of money paid by you with interest

If the property was firstly sold to Samba then he became the owner of the property on execution of registered sale deed in his favour, so he alone could have sold it further. Parallel sales made to Ravi and Venkat are illegal as the original owner ceased to have any right, title or interest to the property after he sold the land to Samba. It seems that the original owner committed cheating on multiple occasions. Your father should undertake a title search in the office of sub-registrar to ascertain whether his title is free and marketable.

if your father having possession over the land then he can claim his right on the basis of sale deed and adverse possession.

1.Since your father has purchased from the first owner he ahs preferable right over the proeprty than the person who purchased it subsequently.

3.So ask your father to file a suit for declaration and then injunction.

3.The second owner has no right over the proeprty and he has no relief agaisnt your father either.

Good luck.

Your father should file a declaration suit seeking to declare the title in his favor based on the registered sale deed in his possession.

Did he mutate the property through the revenue department and obtained the records transferred to his name?, if not ask him to apply for it.

Consult a local lawyer and proceed as per his advise on all such further issues.