Thanks. I guess that's where I need more info: do they only have access to whatever I'm doing at the time on that network, or does being on the same network afford them the ability to actually get into a device (eg, my phone) and get anything from it (eg, my bank login that I used last week, though now I'm signed out; or my google password, which has stored passwords to other accounts)?
I might just use the dummy device option if I can find one. Or force my husband to be the app holder, since he doesn't keep our entire lives on his phone like I do.