Tracking Snapchat activities is such a difficult thing to do. Is there any way through which I can monitor my child’s text messages and activity on Snapchat? I’d like to know if there are any tips and tricks.
If you want to check your kid’s Snapchat activities, then Snapchat Family Center is your best bet. You can see who they are communicating with and set safety controls accordingly. It won’t fulfil your purpose of seeing the actual context of the text messages, but at least you can monitor their app usage. 
Bro… this is such a tricky thing to do. Snapchat whole ordeal revolves around privacy and how no one can see what you are up to. As @DevSyncer mentioned, your best bet is using the built-in Snapchat Family Center. But it does not let you read their private messages or view the content of chats.
You cannot see the photos/videos they send or receive. Moreover, your child must accept the Family Center’s invitation to link accounts, and they can remove you later.
You can monitor Snapchat activities through Xnspy Snapchat monitoring. The app is designed for parental monitoring needs. Through the screen recorder, you can actually see what’s happening on their device, and the keylogger helps retrieve the text message data.
Snapchat’s disappearing messages are the real hassle. They won’t let you see it through any built-in tools.
The only trick is getting the credentials of your child’s ID and logging in to their account on your device. Also, the Snapchat family center is a good option, but only for surface-level monitoring, as it doesn’t provide any in-depth activity tracking.
Instead of relying solely on Snapchat Family Center, you can add an extra layer of safety by using your own device’s parental control features. You can use:
Screen time limits: Apple Screen Time or Google Family Link lets you cap how long your child uses Snapchat daily.
App blocking: Restrict access to Snapchat during school hours or at night.
Privacy settings: Encourage “Friends only” messaging and limit who can see their story.