My sister lent me 15000 for ten years. Her house is much better than mine. How can I get my money back?

The problem is obvious. She doesn't want to pay back the money. Find an excuse and try first. If she doesn't give it, you can go to your relatives, brothers, sisters and brothers and ask them to try it for you. If she said she would give it in a few days, then don't push it too hard. It's not good to hurt the gas, after all, it's a family! Remember to find a good reason. Don't be an unknown teacher! Good luck!