Children's Inpatient Hospital - Family visitors

In a children's inpatient hospital you have lots of individual patient rooms, each with their own private bathroom. These bathrooms are considered residential usage for the patients. These children have visitors, sometimes staying overnight in the patient room with them, sometimes simply visiting. These visitors often use the restroom in the patient's room. Is it acceptable to assign the visitors to these "residential" fixtures or how do you address this in the water calcs? (There are a few toilets in the hallways, but not many...)