Two years after your mothers death a catalog company has informed us she has a debt of 400 your father still lives in the family home they shared he has some money and was un aware of this catalog?
It will be assumed that your father benefited from the
purchases. They can make a claim against the estate, even if it has
been closed. If it is still within any statute of limitations for
debt, they can make the claim. They might be open to a percentage
rather than the whole thing.