It’s one day, it’s your sisters wedding , how lovely to see she wants all her family there. There are so many weddings that exclude children and especially those with special needs. I think you find a way to do it your way, especially if you have your sister on board, get her to make adjustments/understand what potential issues your husband and you are worried about.
my daughter is autistic, we’ve done a few family events, adjustments we’ve made
- she’s only going to wear clothes she’s comfortable in, she would never cope with a bridesmaid/formal dress but we’ve found pretty soft cotton clothes.
- noise cancelling headphones
- a plan of the day
- we’ve talked her through the day in advance and got her excited about planning, making a card etc
- made sure there’s food she’s happy with
- taken her out for a walk, not stressed if she’s gotten unsettled, at some events people have not batted an eyelid and not had an issue, others were we felt it was disruptive we’ve taken her out.
I’d go as a family, but on your terms, if your sister is expecting a perfectly behaved child that’s an issue if she genuinely loves her niece and gets her challenges she’ll get it. Enjoy the day, stop stressing she’ll pick up on it and me being stressed always makes my daughters behaviour (due to anxiety worse), take comforters, toys, drawing an iPad etc
we had a lovely lad at our wedding a son of my ex friend, he spent most of the ceremony outside with his dad, at the reception he played outside a lot, he was there, but on his terms, zero expectations they did anything other than meet his needs and we were so greatful they were there at all and he loved the disco and balloons and the games room we’d set up for the kids.
being a family with a child with a disability is tough but creating memories with a supportive family are so important, you are surrounded by family who should be helping, hopefully your parents other aunts/uncles will pitch in, it takes a village to raise a family is the saying, let your family step up have an amazing day as a family.
your set up may be different but I’d have been heartbroken to think my daughter couldn’t go to my brothers wedding, cousins weddings, grandparents golden wedding anniversary etc it’s never gone smoothly but what day does we just adjust and plan, and find ways to be there while meeting her needs.