A good song for Dad can be funny, grateful, loud, gentle or all of those at once. The best starting point is not perfect writing; it is the stories that only your family knows—his sayings, favourite places, habits and the way he showed up.
Start with three memories, then add up to ten lines about the people, adventures, lessons and moments that belong in the song. Choose a broad genre and mood, and compare three directions before choosing your favourite.
Create the song from one child, a group of siblings or the whole family. Include the occasion and the feeling you want, from cheeky and upbeat to proud and heartfelt, so the brief reflects Dad rather than a generic gift.