T.V.
L.,
If this is not a life threatening procedure, recovery and stay, I would keep it as simple as possible. I suggest you and your son write a book together (words and drawings), about Daddy's operation and stay in the hospital. Hopefully, the hospital will allow your son to visit, if not perhaps you can set up a video connection so Dad and son can talk each day. If that is not practical, they can talk on the phone each day when Dad is able. Since you have a month to plan, take a trip to the hospital, visit the grounds and cafeteria. While I believe in being realistic as possible, I also believe in keeping it simple in children's terms and let him ask as many questions as he needs and answer as honestly as you can.
Your family will be in my thoughts and prayers and I wish your husband a successful surgery and speedy recovery.......Blessings....
PS...The book will be a great gift for close family and friends and a keepsake FOREVER!