I have 2 new clients. They had a child together in 2020 and are living together but not married. The mother is claiming the child as a dependent. However, the father pays most of the bills in the home. Is it possible for him to claim Head of Household? All the rules I read around Head of Household is "you must have a qualifying child". I'm a little fuzzy on "must have a qualifying child" and "must actually claim" a qualifying child. Is it possible for one to claim the child as a dependent and the other (not both) to claim Head of Household? One of the reasons I ask is ProSeries next to checkbox for  Head of Household Filing status - "If Qualified person is child but not a dependent". 

Thanks in advance.