Chad32 makes a very valid point. No reason to burn bridges while they support you. It is a little difficult giving advise when we don't know you, your family, or lifestyle because we might give what we think is good advise but in your situation could make things worse. I personally wonder if hinting at it to feel their reaction out might be a good way to start. Also making sure you make a point when it all comes out that you tell them you don't think they are stupid for believing what you now think is fake. They might feel attacked by your lack of belief.
“What screws us up the most in life is the picture in our head of what it's supposed to be.”
Also if your signature makes my scrolling mess up "you're tacky and I hate you."
Also if your signature makes my scrolling mess up "you're tacky and I hate you."