We are booked for next year and have been in the process of talking to other family member and getting them to join us. On a previous trip my wife's brother and sister have both joined us along with their significant others and we had a great time. We suffered the loss of my wife's sister to cancer before her and her husband could book to go w/us next year, and now my brother-in-law isn't sure if he should still be going or not. He is still interested in going with us as they had planned, but isn't sure if that would be appropriate or not. He wouldn't be some single guy looking to "hook up", just looking to spend time w/family and take the vacation he and his wife had been planning. He asked me what I thought since I am the family's official Couples spokesperson, but I'm not exactly sure what to tell him. Thoughts?