She normally needs somebody to hold him. She can manage changing him with just another person holding him on his side, but he can't really hold himself up that way long enough. She has real difficulty changing the patient's diaper when needed without another person's help.
This person who needs help should talk to a doctor or social worker about getting in-home help ordered. I am only 43 but could not lift, transfer, or support another adult person due to my own shoulder injuries!