Will i still be entitled to child tax credits?

At the moment i am a single mother with a 16 month old son. I only work 5 hours pw and receive income support and child tax credits. My boyfriend has asked me to move in with him (he's not the father of my son) and i would really love to but i dont think i would be entitled to anything except child benefit. Does anyone know if this is the case? Which wouldnt be a problem except i have commitments (bills, car, loan repayments etc) and also anything my son needs my boyfriend would have to pay for which would be unfair as he's not his child. Please no answers suggesting i fiddle the system as i dont feel comfortable with that idea! Thanks in advance