Doc,
Sorry, but even if I did have other adults in my household they would have their own access permissions to my computer or they would have their own, period.
I keep a lot of sensitive, work related information that is not for public eyes on my computer and as such, I cannot risk nor will I allow the possibility of that data to be compromised in any fashion.
Likewise, I don't want everyone else in the family to have access to my emails for similar reasons.
I am a private person and I likewise respect the privacy of my family members. Actually, my wife and I each have our own computers which are networked and we sometimes share information over our network but her business and my business are kept separate from each other, that way I can't blame her if any of my stuff is missing, ruined, etc. When the kids come to visit / play, they use her computer as guest accounts only and if she's present.
Now you know....[^]