Danny Wilson was always a sombre, unsmiling character, whenever I saw him working the doors (okay, perhaps understandable in that profession) and he looked exactly the same whenever 'relaxing' over a pint down the docks too. He always seemed 'on edge', almost waiting for something to happen.
Wilson used to beat Gigg's mother, which is why he later disowned his father.
They say the apple doesn't fall far from the tree.