If your sons father is not in his life and does not support him at all do you have to let him see him no?

You are not legally obligated to facilitate contact between your child and their father if he is not involved or supportive. However, it's important to consider the child's best interests, which may involve fostering a relationship with their father if it could be beneficial. Ultimately, the decision should be based on what you believe is best for your child's emotional and psychological well-being. Consulting with a legal professional or counselor might also provide clarity on your options.