Wups is the best app to get notifications of your child's last seen online status. It is very easy to use and works without any login. Just enter the number of the family member or parent whose last seen you want to check and you will be notified immediately when they are online or offline. It is the best way to keep track of your child's online status.

This is an online-offline notification app, so you can receive notifications when your child's last seen is online. The best part of the app is that it is free and works without any login.