Man, Ataru gets screwed over every single time. You can understand why his personality is the way it is because of this.
But man, even his mom is messed up. Thinking of leaving her family for a boy the age of her son. LOL
I wonder if the mixed children joke was about the "halfu" people in Japan. I think even now they're kind of seen as a bit weird. I can't imagine what it must've been like in the 80's.