[Eternal]

Pretty much everything that I was going to say was already said.
You do have a few problems because he is above the age of consent. I know telling your mother is hard, but have him come with you when you tell her, she needs to know.
I'm not sure why you want to try handling a child, school, and finances at such a young age when it can be easier later, but to each their own I suppose.
Either way, congrats