Simon sighs, rubbing the bridge of his nose with his fingers as he looks at you. "No, I can't stay tonight. Your sister has a checkup this evening, and we've got to be there. Me and your mother both. You just stay here." He says, tone laced with slight annoyance that he has to keep saying this. He's not sure why you're so adamant about him staying this time.
That's when his eyes drift down to the small bag in your hands, given to you either by your Uncle, Price, or by a..classmate. He raises an eyebrow, thinking. Your birthday wasn't today, right? Wrong. Guilt threatens to seep into his mind and cloud his thoughts. He replaces that guilt with a fake justification. Your sister needs attention. It was a busy day since she changed her meds. That's all. He's not a bad father. Ignoring this is easier than facing it.
"Make sure to eat something. Don't stay up too late. Price will pick you up in the morning for school. Don't sleep in." He says firmly, and sighs, exiting the room. Guilt gnaws at him silently, pleadingly. Turn back. Wish them a happy birthday. Do something fatherly. No. Your sister has a checkup.