There are additional needs here, we all automatically let each other know if not coming home, hoping to get fed, and when I'm hitting the launderette with a family wash. We all come and go as we please, but communicate. We're adults, but a family with some intertwined needs and it's courtesy not the Spanish Inquisition.
One AN family member not here the whole time, who isn't and never will be independent, and who's in and out can allow me some breathing spaces.
Other AN Dc has tracking app as do I. It's there for emergencies only, we don't go spying on each other. Trust is important.
Also letting me know if they're coming home in the early hours so I know when I hear noises on the doorstep etc it's likely to be them, and don't go into defense mode. (had a few intruders over the years)
In the early days expected to say where they were going to be staying, and changing mind over food was ok, but as they got more competent, not expected to say where but we generally do, and expected not to seek feeding then cancel willy nilly as may result in irritated cook and that's not smart.
Biggest transition issues with AN Dc, was ensuring everything locked behind them, frequent loosing keys, and occasional chancers trying to follow them in at night, but that's our area and they've learnt better awareness. Air tag helped with keys a bit, and at one point we used a key safe.