 In an early episode, when asked by Captain Mainwaring why Frank calls him "Uncle Arthur" when he is not a blood relation, Wilson states that it was Mrs Pike who had insisted from an early age Frank call him "Uncle Arthur" and that this dates from a point in Frank's childhood when Frank had started to "accidentally" call Arthur Wilson "something else ... Daddy".He frequently threatens to set his mother on Mainwaring whenever he is shouted at or forced to do anything he doesn't want to do.He has the lowest position at the Swallows Bank branch, subordinate to both Wilson and Mainwaring.