Am i unreasonable to ask bride to require masks at wedding when young kids are attending?

Yes, you are definitely being unreasonable. Its her wedding, so its up to her & the groom to decide that (if the venue is not requiring it). If you feel uncomfortable then either you can wear a mask or like she said don't attend.

I agree with this

You're being unreasonable. It's her wedding, and she can do what she pleases and if she doesn't want to require masks, she doesn't have to.

That being said, if you feel uncomfortable with your children being around unmasked adults, you can always leave them at home with a sitter!

Agree with PPs that ultimately it's her decision. You can definitely suggest or tell her you feel more comfortable but demanding it won't go over well. For a little perspective, we are getting married next week with 100 guests, fully indoors. FH and I are both big on mask wearing and always wear masks whenever we go out. We wanted to require masks, but then we thought about the fact that we have an open bar, appetizers during cocktail hour, and a buffet meal. So realistically, people are going to take off their masks for at least 2 hours of mingling, drinking and eating. At that point, it feels pretty pointless to require everyone to put masks back on, just to continue taking them off repeatedly to drink and take photos. We are going to provide masks and guests are certainly welcome to wear them. So just consider that even if she did require masks, there's going to be a lot of times where people won't even use them and no-one is going to want to walk around enforcing them all night.

You can't coerce her into requiring masks. You are out of line. She is correct in telling you that if you do not feel comfortable, you should not attend. Drop it, and decide for yourself whether you wish to attend or not.

Your thought process is reasonable, but your demands are not. Unfortunately, you can't force her to change the elements of her event. If you are uncomfortable with the conditions (and believe me, I understand why), then you should consider not attending if you are concerned about your family's health and safety. Or, perhaps go for the ceremony and skip the reception?

You are unreasonable, if she is following guidelines you can't force her to require masks when they are recommended - which means there is no mandate and they are not required. If you want to wear a mask or have your children wear masks - you can make that decision but you cannot force the bride to change her mind, especially since its her wedding.

Everyone has their own view on how to host events, especially with Covid. You're only say is whether or not you attend/ how you participate. You can not go entirely, mask yourself/family, or maybe even you just go to the ceremony and then go back home with your family.

I personally would not bring my children to an unmasked, questionable vaccination rate event, but again, that's just for you to decide.

If I were in your shoes, I would go to the ceremony (leave kids at home) and then leave without going to the reception. That way you are still involved and in the pictures, but it is a way lower risk.

I totally support masks and vaccinations and basically doing what you can to help stop spread of COVID. but i guess it's such a hard place to tell someone what to do. you can certainly suggest it though just to say hey maybe to help with possible spread, you can....

Agree 100%!

I don't mean this in a bad way but you are being unreasonable, While you have every right to be worried you can't control your sister's wedding, This is your sister's wedding, My fiance and I are not and will not ask that people wear masks or have a vaccine because it's a personal choice,

Yes this I agree