Dreaming about a loved one who is experiencing health issues, like your dad with Alzheimer's, can be quite emotional. In your dream, seeing him looking well and dating may symbolize your desire to see him happy and healthy, reflecting your hopes for him to regain some of his former self. This dream could also represent your longing for connection and the wish to preserve positive memories of him.

Additionally, dreams involving dating can signify new beginnings or a sense of renewal, not just for him but potentially for yourself as well. It may be an indication of your subconscious processing feelings of loss, hope, and the changing dynamics of your relationship with him.

Consider how you felt during the dream. If you felt joy or relief, it might suggest that you are seeking comfort in the idea of his happiness, even if it's just in your dreams. Reflect on your current emotions regarding your father’s condition and how they may be influencing your dream life.