For those wondering neither "Jánosék" nor "Zsuzsáék" imply "and his/her friends" in any way. It's just saying "them, where János/Zsuzsa is one of the group". Could be a family, class, friends, whatever

this is just wrong..

I did not pay sufficient attention to the verb in all the lessons so far where -ék was used, but here it takes plural jönnek...

So this -ék ending is a proper plural? Sort of like belong to -é with a plural -k?