What is a "qualifying person" for Head of Household?

If the person is your qualifying child (such as a son, daughter, or grandchild who lived with you more than half the year and meets certain other tests) and the child is single

If the person is your qualifying child (such as a son, daughter, or grandchild who lived with you more than half the year and meets certain other tests) and the child is married and you can claim the child as a dependent

If the person is your qualifying relative who is your father or mother and you can claim your parent as a dependent

If the person is your qualifying relative other than your father or mother (such as a grandparent, brother, or sister who meets certain tests) and your relative lived with you more than half the year, and your relative is related to you in one of the ways listed under Relatives who don't have to live with you, later, and you can claim your relative as a dependent