My granddad calls me a know it all all the time even though I'm not one, don't claim to be, and I don't act like it. I express my opinion on how I think it is, and all the sudden, I'm a know it all. Yet he says "I've been on this Earth longer than you so I think I know a thing or 2" and I sometimes say "well I've been on Earth long enough to know a thing or 2 myself" I can't know anything without him calling me a know it all, not only that, he acts like he's been through the worst of life, since he was born in 1950, he said he had to work on a farm after school everyday until he was 5 or for 5 years, well I don't think picking cotton on a farm for 5 years is gonna kill you. Then he says **** like "I've done forgotten more than you'll ever know. How the fūck does he know? I could know 2 times more than him by the time him and I die. Point is, I don't think I'm a know it all, I just express my opinion on how I think it is, which I guess is considered to be a know it all in my family