If you don't use more then 100 gigs I'll recommend you US Mobile, visible currently doesn't offer family plan, with us mobile you will save a lot with family plan you get perks like free Spotify.....,
free international roaming data with esim,
To answer the question...
No, Visible does not offer family plans. It would require 6 different accounts (i.e. unique email addresses) but they can all use the same billing method/credit card.
FWIW: If you use GMail, I believe you don't need separate email addresses using the following trick(s):