Logically I would assume that the person owning the money is in debt to whoever inherits the estate. Well since you and your brother split the estate then you would owe 2600£ to the estate and then recieve half back.
HOWEVER
There was no formal agreement written up between you and your Dad for the money before he passed away. In the eyes of the law I don't think your brother has a leg to stand on since there is no contract to prove he lent you the money in the first place.
HOWEVER
There was no formal agreement written up between you and your Dad for the money before he passed away. In the eyes of the law I don't think your brother has a leg to stand on since there is no contract to prove he lent you the money in the first place.