“Grouping” a Node/Entity Reference Field

In Views, how can I "group" by a node/entity reference field? (So the referencing "parent" entity is displayed first and any referenced "children" entities are displayed after?)

• By "Attendee" I am referring to the parent in the reference.
• By "Friends of Attendees" I am referring to the children in the reference.

• I am rendering Name Tags for thousands of nodes in one content type called “Cadet.”
• Each of these "Cadet" nodes specifies a single "Attendee" for an upcoming event.

The situation:

• Some attendees also need name tags printed out for their “friends” who are attending "with them."
• To link these "friends" to the Cadet nodes they are attending with, I used an Entity Reference field: enter image description here

The sorting order / grouping problem:

• When rendering the view, I need these “friends of attendees” to appear “right after” the attendee they are going with.

The final question:

• How can I get the Views module to sort the friends of attendees (children) "right after" the attendee (parent) they are going with? I am assuming there needs to be "grouping" rather than "sorting"... and a relationship might also be necessary. After three days of trial and error on this one, I cannot figure it out. Any help would be VERY appreciated!

Here are my current settings all in one PNG if that helps

I am technically using the Views PDF module, but it has the basic Views functions, so if it's possible with Views, it will probably be possible with this module.