head of household filing

If Divorced and have 2 children I claim one that is oin collage and my ex claims the monor child as head of household 

 

Can i also claim head of household for the 18 year old? She stays with me when she is home from school now and she is qualified dependent on my tax return. I never claimed head of household when she was a monor due to divorce her mother was considered the custodial parent bt now she is no longer a minor and spend most of her time at my house when home from school. and i also am the parent that does the fasfa for her and gets all her parent loans for school. 

 

Thanks you for assistance i just do not want to file incorrectly