My cousin wants to propose at my wedding

No, why would he think this is appropriate?

Hell to the naw would be my answer. That's your day, your moment, and your money. Tell them to pick another day for that.

I would be SO bent if someone did this at my wedding. I don't think you're being selfish at all... he's trying ride the coattails of all of your blood, sweat, and tears (and money) going into this day? Sounds like he's being selfish, to me!

I'm not paying thousands of dollars for someone's backdrop.

I would say NO. That is your wedding day and it should be special for just you & your husband. You only get one day to shine as a couple after all.

I think too, that the girlfriend would appreciate him taking her on a romantic weekend getaway & propose to her then when it's just her & him... when the spotlight isn't shared.

I know it's an unpopular opinion, but it wouldn't bother me at all. Love and joy are not finite resources. I think it would make great memories for everyone involved. But if it bothers you I think you have a right to ask him not to.

HUGE NO. "I am so excited that you want to propose to Sarah, but she's a really special girl and she deserves her own day. I wouldn't want the wedding to overshadow the proposal or vice versa."

Alternative if you're kinda mad: "I'm not sure that's such a good idea Proposing at someone else's wedding can be a bit of a faux pas, and I don't think it would go over well with your gf or FH and I's families. I'm really excited that you're going to propose though! I've learned so much from wedding planning and can totally hand off my guide books to her! I also saw this list of proposal ideas online that were so cute I could forward to you."

Negative.

Big ol NOPE

No way! I think it's super rude for him to even ask to do this....

Allow this only if both you n FH are 1,000% OK with this. You have every right to let the cousin know that you'd prefer to have the day be just about you n FH. No further explaination is needed.

Of allllllll the other 364 days in the year...

Why is the world would someone want to propose this way, anyways? I would be absolutely mortified if FH proposed to me at his cousins wedding last year. I would have felt completely terrible and sick to my stomach about feeling/thinking I took away from her day. Instead he did the right thing and waited two weeks AFTER their wedding and proposed to me in private on a cliff.

I'd say no. Tell him to find his own way to ask her so that's its special for both of them, and that you still get YOUR special day.

Tell him you would prefer if he didn't. That's all. It's your day and it sounds like he will have his soon enough.

No, it's your day

Tell him you are not comfortable with it. You get one day and should not have to share it

Tell him no, say that you think it won't be as special for her if it's done at your wedding

Nope. Hard pass.

One way to tell him no nicely would be, "FH and I thought about your proposal idea and think it's best that it not occur at our wedding. We want to make sure that GF feels really special when you propose and you both deserve your very own day to celebrate. Thanks for understanding. If you need help planning a different proposal we love to help!"

Fuck no would be my answer. You are NOT being selfish it's your wedding FFS! The attention should be on you and FH. Someone else's wedding is not the time to propose. If my FH had done that I would have been mortified and had our "special moment" be marred by how wrong that is. There are 364 other days he could do this. Tell him sorry but not happening. Offer to brainstorm other ways to propose if you want to be nice about it.

"No" is a complete sentence.