Oscar’s a little dickhead.
He has no respect for elders, brothers, or canines. All that matters to him is whatever need last crawled through his moldy bungus of a brain.
Mom’s a pushover, so she lets him get away with murder, and the unrepentant little shit just eats it up. Case and point; Nutter was snugging on Mom, because it’s winter and he was cold. Oscar decided he needed Comfort Tail RIGHT THIS MOMENT, so he jumped up, laid across Nutter, and began furiously yeeting himself.
You can see how happy Nutter is with this development. Meanwhile, our Furry Little Dickhead utterly fails to understand why everyone isn’t happy. He’s happy, so everyone is… right?