Yоur 62 yeаr оld new pаtient presents with generаlized calculus and periоdontal issues including deep probe depths, mobility and furcation involvement. The patient had a massive stroke 2 years ago that left them with some cognitive impairment, speech impairment and reliance on a wheelchair for mobility. He has not been to the dentist since. He relies on his partner to drive him to appointments and to help him with completing medical paperwork. The patient also has some trouble speaking clearly and the partner helps you to understand what he is saying. QUESTION: Which would be an ineffective way to determine if the patient has full decision making capacity or if the partner needs to make the decisions?