On property transfer against Debt

It is not clear from your recital whether the transfer deed made by your uncle (Fathers Brother) is not registered or the Part ion deed between your fathers brother is not registered.

Please note that, A family arrangement being binding on the parties to the arrangement clearly operates as an estoppel so as to preclude any of the parties who have taken advantage under the agreement from revoking or challenging the same. Even if the family arrangement was not registered it could be used for a collateral purpose, namely, for the purpose of showing the nature and character of possession of the parties in pursuance of the family settlement and also for the purpose of applying the rule of estoppel which flowed from the conduct of the parties who having taken benefit under the settlement keep their mouths shut resile from the settlement.

Your query requires perusal of documents and facts and circumstances and the legal position has to be culled out from the available documents.
 

if is registered by way of saledeed then the problem does not arise.