Just double checked this. Currently I am paying for a family plan which gives me 5 users and it costs $18.99 CAD. The family plan with 5 users is $22.99
I believe this recently increased because I kinda ticked off when they launched Stadia and sent all the YT premium customers free Stadias that came with Chromecast Ultras and I recall feeling like an idiot for not having the right plan and Google not being willing to switch me over and give me the free hardware.
I’ve used offline browsing before, it definitely used to be a feature they offered.