I started to take a look at family link (having done switch parental controls + MSFT family safety). And this was where I got to, requests to the API are successful but the cookie will timeout, and so far I’m not sure how to refresh that cookie yet.
I might see if I can take some inspiration from badnest (https://community.home-assistant.io/t/i-made-a-crappy-nest-thermostat-integration-that-will-work-as-a-stopgap-until-alternatives-come-out)