You can claim “Head of Household” status if you meet three requirements (Page 8 of IRS Publication 501):
You are unmarried or considered unmarried on the last day of the year.
You paid more than half the cost of keeping up a home for the year.
A qualifying person lived with you in the
home for more than half the year (except for temporary absences, such as school)
However, if the qualifying person is your dependent parent, he or she doesn't have to live with you. See Special rule for parent, later, under Qualifying Person.