my Favourite father is Arthur Weasley...
to bring up so many kids, with good cheer, and humour is a glorious thing.
to treat Harry and any of their friends as though they are also part of the family is wonderful.

I love Arthur's obsession with all things muggle...
I love how he and Molly interact.
I love his fatherly advice... never trust anything if you can't see where it keeps its brain. (sorry for the paraphrase - but I think you get my point)