Know your role, shit boy; know your role.

As a wedding photographer myself, I can say that if you'd hired a half decent photographer, they'd have made the effort to get a posed shot of the Groom and his family. Also they should have found out beforehand that the groom had a son/daughter and made sure to take some decent shots of you. In conclusion, this is either BS or your dad picked a pretty shitty photographer.

That dog is going places in life

Hey! Don't complain! That will be a memorable moment in a few years. *turns to the side and whispers, "No, it won't..."*

It's FMLs like these that make me think I should have gone into the family therapy business... *Mr Burns-style hand-steeple*

Everyone wanted the dog in their photos because he's obviously more outgoing and sociable than you are, why not try to be more like him? It was nice of him to let you get at least one pic with him as well, you should be grateful for that because I'm sure some people probably missed out altogether.

It's because the dog doesn't do that damn duck face whenever he's getting his picture taken, OP.

Their wedding, their pictures. Sorry. :(

Doggone it, OP, that was a bitch move from your dad and new step-momster.

My family would have done the same