He does not qualify to file as Head of Household. For the purposes of the Head of Household filing status, a qualifying person is a child, parent, or relative who meets certain conditions that enable you to qualify for Head of Household.
Do
I qualify for Head of Household?
https://ttlc.intuit.com/replies/3288637
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He maybe able to claim you as a dependent. See the following
Who can I claim as my dependent?
https://ttlc.intuit.com/replies/5187060
