M.B.
I've never dealt with thyroid issues in someone so young, but I can tell you that people do fine on long term use of thyroid medication. My mother had to have her thyroid removed 30 years ago and has taken medication since - every once in a while she gets a blood test and may have to adjust the dose, but there are no daily implications except for taking a pill each morning. It may be different in children, but definitly doable. Your grandson will be in my prayers.