Son's shared location keeps expiring on iPhone
Son is trying to share location and each time he shares it expires
[Re-Titled by Moderator]
Original Title: Location expired
Question marked as
When your location is shared from the Find My app, you have the option to select "1 Hour", "Until The End of the Day", or "Indefinitely", which you would want your son to select. Also, to prevent this from happening if you have Family Sharing setup with your son, you can have him share his location indefinitely and prevent him from changing it.
Share locations with family members and locate their lost devices on iPhone - Apple Support
Use parental controls on your child's iPhone or iPad - Apple Support
