Tend to Your Business

Tend To Your Business is a side quest in Fallout: New Vegas.

Detailed walkthrough
After Elder McNamara is ousted and Head Paladin Hardin becomes the new Elder, you will be ordered to wipe out the Van Graffs as a show of loyalty to the Brotherhood. After eliminating them, return to the Hidden Valley Bunker. Once there, inform Hardin that you have completed his task, and he will reward you with full membership into the Brotherhood of Steel. In addition, you will receive power armor training.