The younger sister knows she isn't their biological child. She was adopted, and she's the youngest of the siblings.
When she was little, her adoptive parents died in an accident. Her older brother dropped out of school and raised his younger brother and sister on his own.
He earned a lot from working odd jobs, and devoted all his time to his siblings.
He dropped out of high school and never went to college. He wasn't educated, and his younger brother looked down on him a little.
More importantly, the older brother would never agree to his younger sister being with him.
Even though they weren't related by blood at all.
The younger brother was certain his stiff-necked older brother would be furious.
*
Actually, the older brother had always known about his younger brother and sister. They kept it secret from him, but he pretended not to notice, and he was very good at it.
That is, until he caught his younger sister on a date with another man.
He never thought his usually well-behaved little sister would do something like that behind his back.
He'd spoiled her rotten, his brother finally realized. But he'd realized far too late. He couldn't bring himself to hit her, and he couldn't bear to scold her.
The younger sister lifted her head, put on a grown-up's air, and defiantly told him, tears still wet on her cheeks, "I can't help it. This is just what I do. You can't control me."
"Just pretend I'm sick or something."
As she spoke, she couldn't stop crying. The older brother's heart softened, and he couldn't bring himself to say another harsh word.
After a long while, the younger sister finally heard her brother speak.
His voice trembled. He couldn't hide it. Trying to keep calm, he came up with a solution.
A shameless, utterly improper solution.
His ears were red enough to bleed.
*
The day the truth came out, things got ugly.
The younger brother stood at the front door, his eyes red with rage.
"You have no shame," he cursed at his older brother, at a loss for words.
The head of their family looked at him calmly. The younger brother could barely find a trace of shame on his brother's face.
"He didn't get angry with you." He lowered his head to comfort his pale-faced sister, then looked up. "You scared her."
The younger brother grew even angrier. Tears spilled from his eyes, and the hand gripping his sister trembled. He couldn't hold back any longer and roared at his older brother:
"You're the one who scared her!"
"Have you got no shame at all?"
I haven't settled on the protagonist's names yet. This is the idea for now. I'll revise and flesh out the synopsis later.
Theme: Nothing ventured, nothing gained