March 10 -- Do you have to say yes if you are asked to be in a wedding?

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Somewhere I mentioned that we have been invited to a destination wedding in the Caribbean next year. I strongly suspect my husband will be asked to be in the wedding party. Although, maybe not, because it is his sister’s wedding. But, if he is and because it is a destination and they will want even numbers, and I am asked to be in it, (lots of ifs) do I have to be in it? Is there an etiquette around this?

She isn’t my favorite person, but she isn’t my least favorite person. I kinda think of her like tits on a bull – absolutely useless. I wish her every happiness, but leave me out of it. Obviously, I won’t be in the slightest bit upset if I am not asked to be in the wedding

Have you ever declined being in a wedding?