I have a restraining order against my husband and it says parenting time will be coordinated with the assistance of adult daughter. Does that mean he can't spend ono on one time with his son? Only spend time with son if daughter is with them?

No, it means that since he can't contact you, he has to call your daughter to arrange visitation time. I don't see that as requiring supervised visits. But you can go back to the court for clarification.