R.K.
My oldest was 6 when his great grandpa passed away and we went through the same thing with him the entire summer. Him and his papa were very close they spent a lot of time together. All I can suggest is that you be very supportive and explain things if he is worried about you just tell him that things like that don't usually happen to people that are you and your husband's age. Dr. Sears as some very good insight for this on his website askdrsears.com I would slowly ease him back to his room I wouldn't rush it if the first night he doesn't want to go back to his bed let him stay just make it a slow return back to his own room. Explain to him that you and your husband aren't going anywhere and will be there in the morning to make him breakfast and see him off to school this is hard thing for children and they just need to know that things happen in life but they generally young people don't sick and they live along life.