No, at least not get custody if you're rights have been terminated.
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Unfortunately, the termination of parental rights is permanent and absolute. I am not sure what the state of your relationship with your son is currently, but the fact that you have no parental rights does nor prevent you from having a relationship with the child provided the aunt approves. Regardless, when he turns 18 he is free to reestablish a relationship with you if he so chooses.