A free program for Android, by Web-Source Ltd.

Last Seen is a parental control tool that lets you keep an eye on your kids. The Last Seen app for Android lets you track a user’s activity on the most popular messaging apps. You can track and analyze the online status of your contacts and keep an eye on what they do online and who they talk to.

If you want to know if your kids are online or offline, and if they are talking to each other, you can use the Last Seen Tracker app to keep an eye on their activity.