There should be something called a group chat where you could chat to a certain group. Do /groupchat or /gc invite and then type the players names after that. It will then send them an invite to the chat that lasts for 2 minutes. Do /groupchat or /gc accept (player who sent invite) to accept and /gc deny (player who sent invite) to deny. You could invite up to 10 people by just simply typing their name with the invite command too. Also do /gc list to see the people in the group chat.

Invite Example:
/gc invite Logbo_ sam_drums JyClose
or
/gc invite sam_drums
/gc invite JyClose
/gc invite Logbo_

Accept or Deny Example:
/gc accept (player who sent invite)
or
/gc deny (player who sent invite)

The chat will look like something like this:
[GC] DiamondHogger123: hi

(GC stands for group chat)

What the /gc list looks like:
Owner: DiamondHogger123
Members: sam_drums; JyClose; Logbo_

 

What do you think of this @JamieSinn and @andrewkm?

 

:)