You could ask FBF and CBF for their opinions and wants, needs, and limits on how they want to spend the holiday time.
You could assume positive intent and honesty when they give you the feedback. You could give your own honest feedback that your #1 preference is the hotel thing.
See what lines up. See what does not. All come to agreement/happy medium and move it forward so everyone gets the time/attention they need.
I'm more concerned about this:
I think CBF will tell me to go anyhow, I don't think he tells me how he really feels about, well, anything.
Why do you think that? Does he chronically not share information?