Can I delay payment on my second mortgage (MHDC) due to misinformation?

I'm a first time buyer who qualified for an MHDC loan under the assumption that I would get the tax credit in order to pay it back in full. When doing my 2009 taxes, it says if I bought from family I don't qualify. I bought from my brother. Now I find out siblings don't count. I have amended my return to get the money but it won't be in time for the deadline (june1, 2010.

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