Originally Posted by
Nickidt1 
is it fair to take his dad away over money?
Do you really think your situation is only about the money? Your husband is a drug addict. That's the issue here and the money (lack of) is fallout from his addiction.
Your son needs a father, not a drug addict. He needs a father in more than just contributing to his existence, but a bonafide good example of what it means to be a man. Until your husband comes clean, is sober, and working a recovery program, he is not going to be able to be a real dad to your son. He is an addict and that is what your son is getting from his father. Face the truth of the situation and do what is in your son's best interests.