[lpi408]

I have done what you are attempting to do a couple of times.

First have the phone activated on your bothers account, submit all rebate(s) under your bothers account and wait for all rebates to process 100% before activating the phone on your account. Once all your rebates have been received you will be free to activate the Epic on your account. You will NOT receive your rebate(s) if you activate the Epic on your account before the rebate(s) have finished processing on your bothers account.

Good Luck and I hope you enjoy your new phone, I think the Epic is going to be my next phone also.