this could be corny but when i was a baby i gave my dad a mug that said
"My belongs to daddy"
he still has it.... (i possibly gave this to him when i was older but it could be work as perhaps daddy is going to need some coffee to stay awake?)
could also work with a keyring that you could put a photo in or in my case i could buy hubby a special spanner with something like that engraved on it... he'd love it