Is there a way to access my child's text messages and be able to read them from my device without my child knowing?
If they are using Message+, then you can log in to Message+ (app or browser) using whichever phone number login you want to see the messages. Of course, you need to know their MyVerizon login for the specific line.
We understand the importance of keeping our children safe. To better assist you, tell us. What is the texting app your child is using? Are you the account owner?