Members create members

Pretty simple question with a (I am assuming) not so simple implementation...

I would like the give paid members the ability to add "staff" members to their login. Basically these new "staff" members would be a simple registered group that can view protected content (easy enough) but they need to be tied to the parent account (the company). If that company ever discontinues their membership, they need to be deactivated and their staff would also follow suite.

Most of this is easy in their own little parts, but all together is something entirely different. I suppose I could use the Role Assign and give that role assignment permission to the company member role... but this simply gives access to create the user. Once that user has been created, the user would never be tied to that company...

Any direction would be appreciated!