If I admend my return to remove a dependent, when will the other person be able to claim that dependent?

[ErinH]

Yes, but not until your refund has been processed.  Amended returns have to be mailed, and it takes up to 16 weeks for the IRS to process an amended return. 3 weeks after you mailed your amendment, you can start tracking its progress at the IRS Where's My Amended Return? site.