maglib
Level 10

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you would all 3 possibly meet qualifying relative rules and even your grandmother may.  Issue is he had to provide more than half your support so I'm not sure if he meets this rule or your grandmother does as the cost of the home is a big portion of the support test. see p. 16 for support test calculation  <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-pdf/p501.pdf">https://www.irs.gov/pub/irs-pdf/p501.pdf</a>  your grandmother may be the one who can claim you both....
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I am NOT an expert and you should confirm with a tax expert.