I've seen a few people ask for gift ideas for Father's Day. I just came across these personalized books that are adorable! You can change the characters' looks and the kid's name and write your own dedication page. They're almost $50 though 😭
https://hoorayheroes.com/personalized-book/custom-daddy-book
Why don't you do simple personalized mugs, a name keychain and shirt. ? These sold a lot for me.