I want to see my child’s texts through family sharing

we decided to get my 12 year old a phone Tuesday because he is now at a private school and I am his daily ride home. We wanted him to have contact with me incase I’m running late from work. The reason we got him an iPhone was so that I could see his text messages. It was recommended to me to add my son through Family Sharing and to not share an iCloud. I was not aware that I wouldn’t be able to get his text messages. I think it’s important as a parent to monitor his contact at his age. What other solutions are there with Family Sharing?