First off, your son is considered by the universty to be an adult, regardless of the fact that you are paying tuition. If your son is uncomfortable with the situation, then he personally needs to go to housing or the RA on his floor and seek a room change. The university will not respond to parent's requests, even if parents are paying the bills. Second, universites all have policies
about having guests in rooms and if there is a conflict with a roommate objecting to the "visitor" then there is a procedure for your son to follow and it begins with notifying his roommate and then going to the RA and then to the housing office if it is not resolved.
Your son would have to make the complaint and seek the change on his own and your efforts are really fruitless unless your son takes his own stance and seeks the move.
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