AITAH for saying that my brother in law and his future wife can’t sleep in our bedroom while we host them on their honeymoon?

I (35F) and my husband (36M) are fortunate enough to live in an area of the world that is very beautiful, and as a result, frequently visited for honeymoons.

My brother in law (30M) and his soon to be wife (28F) are getting married in August and want to honeymoon in the area where my husband and I live, and they asked around a month ago if they could stay with us on their honeymoon. We agreed; they are family and are also tight on funds. We are happy to help and host them.

However, they asked my husband last week if they could stay in our bedroom on their honeymoon. We have a two bedroom home, and our guest room has an air mattress that is used for when friends/family stay (otherwise, it is my work-from-home office, hence why we dont have a typical mattress in there). My BIL didn’t really get into the specifics of why they didn’t want the guest bedroom/air mattress, but the gist seemed to be “we dont think an air mattress is honeymoon appropriate”.

When my husband asked me about it, I was honest with him and said I wasn’t comfortable with his brother and his new wife sleeping in our bed on their honeymoon. My husband agreed with me.

Apparently us saying no to this request has caused some issue in my husband’s family, particularly with his sister whos saying we should just let BIL and his future wife stay in our room as “it is THEIR honeymoon and they shouldn’t have to sleep on an air mattress”.

We love everyone in this scenario, especially BIL and his future wife, and don’t want to cause a rift so my husband is sort of leaning towards acquiesing to their request, however, I am not down to change my mind on this. It honestly really grosses me out because I believe that the reason they want our bedroom is so they can comfortably bang during their honeymoon on a regular, not-air, mattress.