There is an app that you can download that let’s you see his texts. I can’t remember the name of it but it is a feature that allows parent access. Google that. Then, great the other phone like a “new phone” and disconnect it from the first phone - so he chats see your texts

Not that I know of. It’s all or nothing.

I have 2 iphones. I think they are 6's? I want to let my tween use one of them. Right now texts to/from either number show up on both phones. I want one phone to receive texts from both phones, but not both phones to receive texts from both phones. In other words, I want to be able to see his texts on the phone that I'm using, but I don't want him to see my texts on the phone he is using. Is there a way to do that?