The "what ifs" are terrible. Instead, focus on "go ahead and book a FAMILY vacation..." That is great!!
Remember to keep all of this in perspective. We all tend to wear our emotions on our sleeves during these difficult times. Be supportive of the idea, validate his thought process of family fun and then continue to act how you have. Non confrontational.
What you are doing is working. Sit down and write down what you believe these things are. Whe you have moments of uncertainty, visit the list. These are ALL things YOU did to turn him around. Review the list and get back on track.
This is a continuous work in progress, focus on the prize and stay patient.
