Events+ RSVP, should I use tickets?

Hello, I have a scenario and I need help on the plugins that I will need.

I want to create events on which users would be able to RSVP for themselves AND additional people if they want. The events will either be free or paid and will have a specific amount of seats.

So a family of four should be able to create one Wordpress account (or login via Facebook, Twitter or Google) and RSVP for all the family members. So one account, three RSVPs.

Is that somehow possible?

With Events+ I tried and it is not, as each user can RSVP for themselves only.

Any help is greatly appreciated!

Thank you!