An essential person is someone who:

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  has continuously lived in the individual's home since December 1973; and

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  was not eligible for State assistance in December 1973; and

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  has never been eligible for SSI benefits as an eligible individual or as an eligible spouse; and

• •

  State records show that, under a State plan in effect for June 1973, the State took that person's needs into account in determining the qualified individual's need for State assistance for December 1973.

We consider the essential person's income and resources in determining SSI eligibility and payment amount.