Why, when you check 'other' turbotax is incapable of filing head of household?

IRS says that relative does not have to mean an actual blood relative. I quote:  "Relationship – the person must have lived with taxpayer for the entire year" .

And yet there is NO way to get turbotax to give a head of household with picking an actual relative.

If you pick "OTHER" turbotax WILL NOT let you change to head of household.