How about Kanon - does that suit the bill for your AMV as well? IMO it's better than Clannad in every facet. I like Clannad, don't get me wrong - but Kanon is better.
If you're at all interested, I just finished a Moribito fanfic and I'm always keen for feedback. It focuses pretty heavily on the Balsa/Chagum relationship and what happens to them after Balsa returns from Kanbal.
You're welcome for the help on the "Father/son" topic - it's a sadly underrepresented category in anime. And while it's not father/son, if you watch anything I recommended, please go for Seirei no Moribito - I really can't possibly recommend it highly enough.
I'm happy to see i'm not the only one that loved this anime ^^
I remember that when i watched the last episode i was left in awe with the clear knowledge in my mind that i had just witnessed a fantastic story that i would never forget. And yet i was the only one among my friends who was so enthusiastic, it was kinda sad ^^;
It is an anime that never gets a mention on the suggestion forum so i was happy when i found out i could recommend it to someone ^^;
Oh BTW your avatar is one of the things that made me try Nanoha, it made me curious about the character. I'm not really fond of magical girls probabily because i've seen too many of them when i was younger, but i'm glad i made an exception for this show, the first episodes make it look like the usual thing, but then it becomes something unique.