For parental control of your children and your family you can safely use W-Family-Tracker.
You will get notifications when your family members are online and offline on Wapp and you will see the last seen activity of them.

App Features;

* Receive "Online" and "Offline" Notifications
* Last Seen Activity Time in WA
* Online Time Reporting
* Instant Notifications
* Receive reports by email
* 24/7 User Support