Your family's profiles can be accessed on other devices as long as you use your login email that’s registered in the app already. You can check which email this is in the app under Menu > Settings > My Account.
We are completing our rollout of this feature very soon, so in the meantime, the profiles may not be accessible across Android and iOS devices. They will be accessible on the same platform and shortly, they will also be fully accessible across platforms too.
Have more questions? You can talk to us through the app. Tap on Menu > Settings > Send Us Feedback / Contact Support :)