In that case they are right
If you were paid back there is 6 years to make a claim for any debt
If you were paid before anyone else you could be a preferential creditor
However you could argue because some 5 years has elapsed you are no longer preferantial.
It is a matter for you
Can I clarify anything?
The longer it is the harder it is to argue that
Because you are related, that is where the argument is coming from
Does that clarify?