I'll give you a similar one. My brother is a nuts leftist too. I will give him a tiny bit of credit, as he does work a good job and has for a long time seems to not be totally atrocious at raising his kids even. Outside of that, he's all about their Covid stuff and the classical leftist koolaid like racism, free stuff, etc.

My dad is about the same politically as me, maybe a tiny bit less "redpilled" than I am but not by much. Mom is what I call a religious democrat, meaning the way I see it she thinks like a leftist in a lot of ways, but would never support them because of gays and abortion. We both grew up with both parents around. I was the antisocial nerd and he was the social butterfly. I really think this personality difference is a huge part of it. My mother would even tell you I was the stubborn think for himself kid, even to a fault at times. He was a gullible people pleaser, also often to a fault.

Take that personality and add in the fact that his wife is a raging leftist and he's kept up with so many immature leftist friends that never grew up he went to school with, and you have the difference.