The spouse may have opted in, but the kids certainly didn't. Even if they say it's ok, they likely assume they have to agree, or they don't get to go anywhere alone, don't get to use the phone, etc. Or -- worse -- they just don't yet understand the awful implications of living in a society where everyone can be tracked. And so now they're conditioned from a young age to think this is normal, and then when they're in their 20s they don't bat an eye when the government passes a law requiring that the smartphone OS makers share real-time location data with the government at all times. That may sound sensational and hyperbolic, but I honestly don't see that as particularly farfetched, given the growth of government overreach over the past decades.