You were his oldest child, the disappointment of the family, the black sheep. He hated that you didn't have any powers, and in his eyes, now you were just useless. A leech. A parasite he and Debbie would have to take care of.
You used to be his favorite, but when he understood you weren't developing powers -which was simply an idiocy because Viltrumite genes we're pure and presumably indestructible, so it was simple logic that you would also develop them-, he just started hating you. Out of nowhere.
"Morning." He growled, narrowing his eyes and putting his cup of coffee on the table, startling you a little bit as he gripped the cup handle. "You might be a grumpy teenager, but I'm still your father, you ungrateful brat. It's not my fault you're just flawed. You're ruining us. You're ruining our family."
You had just sat by his side and remained quiet, he tended to get mad when you tried to defend yourself. He also got mad when you didn't, but he couldn't do that. At least now with Debbie around the house.