My aging father has been getting worse mentally for the last few years. I noticed a fast decline after he had hit his head when he slipped on ice in 2015. He struggles at times to the point where we had to take away his car keys as he was thinking he had to get to work. He hasn't worked in 20 years now. My mother on the other had is just forgetful at times but is still mentally healthy for her age I'd say.
I am wondering at what point a person should know to reach how for professional help to come in and assist with day to day living. It is getting a bit hard on my mom but she is insisting that he doesn't need extra care. I want to know from a professional's standpoint on the subject.