Every person who uses any Apple product should, without question, use their own unique Apple ID on their Apple devices, (including children). Your Apple ID should not be shared with other people to use on their Apple devices, as it will cause numerous problems for all parties involved.
The easiest way to set enable Screen Time is to simply open up Settings app and tap 'Screen Time', and then tap, 'Set Up Screen Time for Family'. You will then be able to set unique restrictions and limitations for each family member as you deem appropriate.
Most applications that track your location are not trying to spy on you with nefarious intent, but do so for advertising purposes. However, you can stop them cold in their tracts by managing these applications and services, determining which app or service can track you, and when or if they can.
There are 6 security measures that you can take right now to ensure that your data stays private and secure, even if your device is lost or stolen. 1) Use an Alphanumeric Passcode. 2) Lowdown Your Lockscreen. 3) Set up iCloud Keychain. 4) Protect Your Data Using Secure Erase. 5) Secure Your Browsing Experience. 6) Enable Automatic Software Updates.