I don't want to pay my mother to see my son
Why would you have to pay your mom to see your son? Is your mom trying to get money from you?
No, not any more
It's good to love your kids, and you shouldn't have to pay your mom. That is inappropriate.
I don't give a shit she's is evil.
You should make every effort to be with your child as he does not understand what is going on. However, you should not have to pay just to see him. If your mom is actually trying to prevent contact, then it would be wise of you to seek free legal counsel on the matter.