Even probably the most macho male turns into a huge Teddy bear when he puts on his "Father" hat. Honor this aspect of Father's identity with anything symbolically gentle - similar to a framed nostalgic photo - or something literally soft - just like the plushest bath robe or slippers http://bookmarkbirth.com/story5465363/best-gift-for-dad-from-son-can-be-fun-for-anyone