As stated in the title, my father has dementia at what's considered a "young" age, most likely stage 2. He's been hard to talk to especially when it comes to the safety of me(14) and my sister(12). For example, last year, once on the subway my sister had taken a seat next to a "mentally disturbed" person, as there was nowhere else to sit. In the middle of the car, there was a man passed out on the floor, so my father went to the operator to tell him. Police were called, and the man was removed. After that though he started talking to a woman and talking about his USMC service history (4 years in training, little combat). While he was talking to the woman however, the man sitting next to my sister was screaming about politics and migrants. My father paid no attention, and afterwards said he was "giving the guy looks" and "was right next to him" when he was across the car (about 11 feet/3.3 meters). He's become increasingly frustrating to talk to, and can't even remember mine or my sister's birthdays anymore, claiming he remembered because "It's on my phone." Along with this, I've also started forgetting a lot of things in school and am worried I might have dementia too. I don't know what I'm supposed to do.