Adult living with parents who will not claim me, would they have to include my income in their tax return?

If not, he doesn't qualify your fiance as head of household. You and your son aren't related to him, so you don't either. And anyway for HofH he'd have to pay OVER half, not split 50/50 - that's not OVER half - so he is definitely not HofH.. If you made $3900 or more, he can't claim you OR your son.

In any case he can't claim a child tax credit or EIC for your son.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.