When you enter your filing status as Single or Married Filing Separately and have entered a qualifying person as a dependent on your tax return, the TurboTax program will ask you a series of questions to determine if you are eligible for Head of Household. If you are eligible the program will give you Head of Household filing status.
See this TurboTax for Head of Household - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-filing-status/qualify-head-household...
