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Quoted:
You'll need a schedule K from the estate's personal representative.
So from my grandmother then since she handled that?
Yes, but now that you gave us more information you need to dig into the tax instructions. You can call the IRS for help, too, but count on being on hold for a long time. You could also call the company that issued the check for more information.
The estate's personal representative (or still called the executor in some states) has a fiduciary responsibility to make sure everything is right while in that role. In Missouri, the probate court provides very close supervision of the entire process
except for dealing with the state and Federal taxes. The instruction books are intimidating, even for a fairly simple estate, but there is a pile of paperwork demanded by the IRS. (Missouri was simple.)
If you received the check in 2011, then report it as 2011 income according to the instructions.