So do you and your extended family mostly know where each other is most of the time? What level of accuracy is involved?
Its gotten to the place where people don't even communicate addresses, and if you don't know to look at the stalker app to meet up with them, you'll just be left out. Its ironic that saying it that way still comes across as problematic (your boyfriend/parent asked you to share your location!??!?) but its very common and very benign.
You can stop sharing at any time and the recipients just shrug it off like "yeah that's understandable"
As far as stalking or surveillance, I mean most people live very boring lives so watching them go from home to work or school: you have to really have nothing going on.