3 weeks ago
Cannot add family member
history deleted after 3 hrs
3 weeks ago
If you do not have a Nest Aware or Nest Aware Plus subscription, then you only have access to video history for the most recent 3 hours (https://support.google.com/googlenest/answer/9681538).
I can't tell what's going on with your attempt to invite a family member. Note that they have to have a gmail account. This is Google Nest's Help topic: