My sister was 50k yuan short on buying a house, and I didn't hesitate to lend her the money.

Later, during dinner, she sarcastically said, "If you hadn't only lent me 50k yuan, I would have bought that 140-square-meter big three-bedroom apartment. But because you couldn't come up with more, I can only buy a 120-square-meter one now."
Her 10-year-old son also pouted and said, "It's all Uncle's fault for being too poor. Otherwise, I would have my own study room."
I burst out laughing in anger and immediately took out my phone to show the transfer record:
"Sis, since my 50k yuan delay caused you to miss out on buying a bigger house, I can't be the villain. Now, give me back the 50k yuan, and go gather the down payment to buy the 140-square-meter one. Don't have any regrets."
My sister was stunned instantly, stammering that she had already paid the down payment.
I sneered and said, "That's your business. If you don't return the money within three days, I'll go directly to your company and let your boss and colleagues see how you treat your brother who lent you money."