I would say the kid also. Unsure of the significance on the match book with Jimmy's name on it, I wasn't paying much attention in the beginning. As a previous answer, the wife seemed happy. As the plot starts, there's a scene in which Brian sits across the house watching the family and cancels on the trip. That leads me to think it was him watching over his wife. If he began dealing, it might have been best to disappear for his family's safety, let the house fall through and probably inherited an Escalade too.