The thread underlines something which is unfortunately far too late for most people affected, and that is when you are locked into a serious family problem you can’t get out. It’s like changing your religion. Good luck!
The other thing — as someone has already hinted — iPhones are now way behind Android phones technically. They’re like an expensive fashion accessory. Many people still use one for convenience, especially if they have Macs, but I think even that will disappear.
You really need a way to assert your independence. Phone GPS is useful for finding where you’re going on the way to a punt. That needs to be private (it’s not private from google but it needs to be private from a ball-and-chain). So you need rules, either your own or invented business ones (accidentally leaving it on silent, if that’s what you do for instance, won’t wash after a few times). Reasons why it’s on silent. Reasons why your ‘work phone’ can’t be networked to your family. Reasons why you need radio silence for a few hours. Even (obvious) reasons to save battery.
Something the techies might confirm — what I do for cities I visit often is download the google map to the phone. It means it will still work (with less features) even in airplane mode. For instance, it will find a location on the map for you but it won’t give detailed directions on buses and so on. So I’m not sure how that works... it’s using some sort of GPS to find your location on the map but it’s not available to the phone’s log so doesn’t seem to show where you’ve been on the googlemaps tracking. You could also get a phone, even a small brand one, and ‘discover’ that ‘unfortunately’ it doesn’t have the feature, or ‘find’ that it is ‘unreliable’ on your existing phone. (And it won’t be telling porkies if it’s none of their business as they won’t ask the question.)
You are your own person. You have to
deal with your family, politely, responsibly, even lovingly, but as your own boss. I can imagine you might want group tracking on to keep an eye on your kids or meet your ball-and-chain for the theatre — but you also have your own life, biologically,
whether or not that includes (what some people would call) your dirty little secret or whatever abusive comments they might have if they were to know things that are none of their fucking business (pun intended)!
Enjoy.