I'm not sure in the resources or references of the last answer but from my understanding their is literally hundreds of Applications on Google's Play Store that are All specifically targeted towards parental and elderly care..
These applications can assist you in doing many things, from identifying communication with a predator online to making sure your grandmother is still walking around the house at least once every so many hours...
Due to Android changes throughout it's evolution it is hard to say exactly what Application will work on your device..
Due to my research as an Android Enthusiast & Independent Developer, I have found that you are Most Definitely going down the path of Launchers..
The Launcher is the Very First application that runs on Android, If you use a specifically designed App Locker in conjunction with a Launcher... You will have the ability to perform a full device Lock Down, So-To-Speak.
Obviously you can find prebuilt Launchers Source Codes online, if you want to implement your own App Selection Screen within the device Launcher.
I hope this at least helps you find a correct solution on your endeavor.