[GSlob]

Well, if you would feel uncomfortable attending - then do not attend. Invent some good pretext, express sincere regrets, and try to compensate for it by spending the money you would otherwise have spent on the travel there, towards "wedding" gift enhancement.

[WorkingClassFilth]

What GSlob said...after all, he knows your thoughts and he's expecting you to compromise your position. Be polite, be kind, but be true to your principles. A pleasant response gives you creedence later on.

[Frwy]

I don't think this is the time to lie. Boldly tell the truth and decline to go. He already knows how you view his circumstances. If you accept it in your cousin and not in others, it makes you a hypocrite.

Is that what you really want to be to your cousin. Trite as it might be, honesty is the best policy.