This conversation is the reason many families wait years longer than they should. Not because nobody noticed, but because nobody knew how to start.
Raise it when you are both rested and on your own, not at the end of a long family dinner. You are opening a conversation rather than delivering a verdict, and the first attempt does not have to settle anything.
if the conversation goes well, have something ready.
The Memory Exam is taken at home in ten to fifteen minutes, which is a much smaller ask than a clinic appointment. The early warning signs checklist can help you describe what you noticed, and preparing for a doctor's visit covers the next step.