On my system, family members can see live video and recordings for current day only. Selection of previous days is "greyed out" and thus not accessible to family members. I am not sure if this is an intentional limitation or a bug, as it makes no sense to restrict viewing of older recordings.
Family members should also have access to functions such as switching between "home" and "away" modes.
Also, having created a family login for myself using an alternate email address, when I log out and log back in, the shared devices are not visible in the app, which indicates I have no devices. This login previously had access to the shared devices, as intended, but can't access them now.
The reason for creating a family login for myself is to allow me to use the app on 2 devices (iPhone and iPad) without having to enter a password each time I swap to the alternate device.