Deck Repair

Replace the post. Fill in the hole with concrete after you remove the rotted wood. Get a post standoff that keeps the wood away from the concrete and put it in the hole when you fill it with concrete. Make sure it's exactly where you want it because the new post needs to be directly under where it is now.
Tell your brother that you never bury deck posts on concrete, always use standoffs.
Ron

Like Ron said. And it looks like you have existing concrete, just need this:

http://www.strongtie.com/products/connectors/AB-ABA-ABE-ABU.asp

Use a wedge anchor to hold it down. A post strap on top, inside wouldn't hurt, either. Be safe, GBAR

Wow.. thanks for your help guys. I will get a 10' treated 4x4 and one standoff. Upon further inspection, there is a metal standoff on the existing pole.
So, if I understand this correctly. I'll remove the pole and old standoff. I may end up removing all the old concrete too. Refill the hole and then anchor the new standoff in new concrete. Then measure twice and cut the pole to desired length, and nail it in place.

Thanks again guys!
I really appreciate it!
If I have anymore questions, I'll be sure to post again.

GBAR, I've printed the link so I can show guy at Lowe's just exactly what I need. I think the ABA44 should work. It's just my luck they won't have it, and I'll end up talking to someone who doesn't know a thing about decks. :laughing:

Ah.. not far from me. I'm right in between Canton and Cartersville. :thumbup:
I'll PM ya if I run into trouble.

Thanks!!