Didn't Dawn refuse to go because Buffy wasn't invited? I wonder whether Whedon's making the point that Sisterhood's more significant when it comes to support (in every sense of the word) than fatherhood?Yeah you're right. Buffy's so selfish, wanting to go to that wedding. Back off Buffy!
It'd been funny if it was revealed only Hank didn't want Buffy there but Paige did want her invited all along since she and her kids like her.Buffy and Hank's relationship is shown in the comics. From what I remember, Hank is to remarry and invites Dawn to the wedding, but not Buffy. He says something like 'trouble follows you wherever you go and I don't want that at my wedding'. Of course Buffy is hurt, but Dawn tells Hank where to stick his wedding. I don't think they have any contact with him after that. I assume Joss wanted an end to the relationship, to tie up old threads.