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Yes, they do go by what he earns. In Florida, child support is based on child support guidelines. Both parents' net incomes are combined, and a basic child support obligation is determined using a chart. Then, the child support amount is calculated based on the payor's percentage share of the combined income.
Child support and visitation are separate issues. The court will not discontinue support because the mother refuses to allow visitations, because that harms the child. If the mother is denying court ordered visitations, your son can bring contempt proceedings against her. In some cases, the court will order a change in custody where the custodial parent purposefully refuses visitations.