Can sale agreement be cancelled after property's registration?

Yes, they can sue you for cancellation of the sale agreement on various grounds. However, as you had purchased the property way back in 2006 and got it registered in your and your partner's name, that means 8 years have already elapsed, thus, it is barred by the Limitation Act.

If they do it now then the onus is on your partner and his wife to give satisfactory reasons to the court as to why the condonation should be given to them for the delay in filing the cancellation.

Kindly contact us for any further details and action.