This was one of the things I read, but I also read on the IRS web-page, about unmarried and if the other parent IS claiming the child as a dependent then that child can not be claimed as your qualifier for head of household.
I just don’t want to see this dude have to pay back several $K in the future, because some on-line return program had a problem that no one found.
Before being married, I was in a similar situation, my girl would file head of household along with the earned income credit, and we would get the most back that way. Thats all changed now that we are married.