Depends on the nature of the relationship. Cats in the Cradle (Harry Chapin, with some lyrics by his wife, Sandy) is probably the most famous, and it's very moving, but if your relationship did not involve a lot of missing him, it may not be appropriate.
Return to Pooh Corner (Kenny Loggins) is also a real tearjerker, especially when you reach the end of the story.
Endless Night, from the Broadway version of The Lion King, expresses Simba's pain over Mufasa being gone.
I'll also mention The Seasons (Roger Whittaker), although that's actually about his grandfather. Whittaker also sings at least two songs from the father's perspective: You'll Cast a Mighty Long Shadow and Sing Away Your Tears.
John Denver recorded Flight (On the Wings of a Dream).