No, your son has no inherent right to be on this plan, and your ex could substitute another beneficiary (for example, a step child). The only way your son would have an enforceable right to be the beneficiary would be if the terms of your divorce (the court order or settlment) required it: in that case, you could bring a motion or legal action in family court to enforce the terms of the order or settlement and force your ex to restore your son to the plan. But unless it was required in the divorce, they could do this.
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