Let me put the entire CA definition so you can see the whole thing
You are keeping up your home only if you pay more than one-half the cost of keeping up the home for the year. Generally, if two or more people keep up the same home, only one of the people could pay more than half the costs and qualify for the head of household filing status. If two or more families occupy the same dwelling but maintain separate finances, and each family does not contribute to the support of the other family, each family may be treated as keeping up a separate home. The taxpayer who provides more than one-half the cost of maintaining that separate home is treated as keeping up that separate home. To determine whether you paid more than one-half the cost of keeping up your home, complete the following worksheet.
Do not include costs of clothing, education, medical treatment, vacations, life insurance, transportation, rental value of a home you own, or value of your services for those of the person qualifying you as head of household. Temporary Assistance for Needy Families (formerly Aid to Families with Dependent Children) payments you use to keep up your home do not count as amounts you