1. Hope you have added Defendant No. 2 & 3 as necessary parties to enable the court to declare that all the subsequent transactions made after the transaction made by defendant no.1 are illegal, hence invalid.
2. If the transfer of the property to defendant no.1 is invalid, all subsequent transfers also will be invalid.
3. However, the defendant no.2 & 3 shall have to submit their written statements before the Court finally decides on the matter.
4. Once the Court decides that the first transfer is invalid, it will also declare that the subsequent transacts are also invalid and thereafter you can file the execution petition.