The brother who wanted to marry his sister

An old woman and an old man had two daughters and two sons.
One daughter was ugly, and the other was beautiful.
The younger brother decided to marry the beautiful one.
But she did not want to.
She cried and did not want to.
She washed her silk cloths and went to the water and rinsed them.
She rinsed and cried. It was cold.
Her hands and feet were freezing.
She came home and knocked on the door, but it was locked.
She knocked on her mother’s window, and her mother answered:
I’ll let you in if you will call me mother-in-law.
She knocked on her father’s window, and he answered:
I’ll let you in if you will call me father-in-law.
She knocked on her older brother’s window, and he answered:
I’ll let you in if you will call me brother-in-law.
She knocked on her sister’s window, and she answered:
I’ll let you in if you will call me sister-in-law.
She knocked on her younger brother’s window, and he let her in.
He hugged her and kissed her, and she said:
Let the earth open up and swallow me!
And the earth opened up and she escaped.