Anonymous wrote:OP here - thanks everyone!
To the poster about vacation - it's a really cheap vaca we have planned. We are driving to Pittsburgh for 2 days and then to the Jersey shore and staying at a motel for 3 days. It's significantly less than the cross country trip.
I just feel badly about declining. I'm not close to my cousin but his parents are different. I haven't shown up to any family weddings out that way either which is why I feel a bit guilty!
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Look at it this way, OP: you haven't shown up to any family weddings out that way, which lets the family know that you are unlikely to show up to this or any others either. They all know it's a long trip for you. They all know you have kids who are at ages where it's just not a good time for them and it's difficult for you.
Decline and send a gift. Don't feel guilty. It's not your aunt and uncle getting married, it's your cousin to whom you are not close, even if you're close to cousin's parents. They will understand. If you were very close to your cousin, I would say for you to go alone -- it really is OK to go alone -- and see if you can crash with someone local rather than pay for a hotel. But that's moot since you're not close to this cousin. No need to feel guilty.