Title/responsibility for Guest

We are getting married 2/4/24💕 We have a dilemma🤔 We are having a small bridal party (2 & 2) because we are going away to Las Vegas and only inviting immediate family and a couple close friends. We originally were going to do 4 & 4 but we switched it when 2 of my friends sounded unsure if they’d be able to make it at all due to finance's, which I totally get, so I didn’t want to add pressure by asking them. With that being sad, my fiancé feels really bad about not including his brother-in-law due to this change (his 2 groomsmen/best men will be his 2 brothers & my bridesmaids are my sister and his sister). I also would love to include his brother-in-law in some way but I don’t like the idea of uneven bridesmaids & groomsmen. What are some ideas of ways we can include him?


Sort of related, at this point in time it does sound like they will be bringing both their children (one of which will not even be 1 year old by our wedding). Just thought I should add that in, in case that factors into anyones suggestions.
Thank you, thank you!!