What is the main content of this story between brother and sister?
Once upon a time, there were two brothers and sisters, one named Lettler and the other named Gershona. Wright is her brother and Gershona is her sister. After my mother died. My father married his stepmother to take care of their brother and sister, and the family has been living a poor life. One night. Something urgent has suddenly happened at home, and we need money badly. However, their families usually don't have enough food. Now you need so much money that you can't take it out. When they were very anxious, their stepmother came up with an idea. Sell Wright and Gershona. Although my father is very reluctant. But now there is no other way but to do so. So, the next morning, dad said to Shi Mei, "Son, dad took you to sell things today. After selling things, will dad buy you food? " Shi and Mei said in unison, "Good." When I arrived at the pawnshop, my father said, "Son, my father will go outside and come back soon." Shi Mei and Shi Mei agreed. After a long time, when they saw that their father hadn't come back, they went outside to have a look, but they couldn't find their father. Just then, a young man came out of the room. He is kind to his younger brothers and sisters, giving them beef, mutton, chicken and milk. A few days later, the two of them realized that the shopkeeper was a hateful devil. A few days ago, he calculated that the two children were going to the pawnshop to sell them. He killed the shopkeeper of the pawnshop and became the shopkeeper himself. His heart is to eat lobster. When the two of them found out. Very surprised. The devil saw something bad and began to show his true colors. He forced Gershona to cook Wright, and Gershona had to do so. The devil saw it and blamed her. Said she was not serious about boiling water. Can't boil water. Gershona suddenly had a good idea. She said, "Mr. Devil, I can't boil water. Can you try it? " When the devil heard this, he spoke angrily and tried to act. When he put his head in, Gershona rushed him in, and the devil was burned to death. The two of them were rescued and got countless jewels. A few days later, they found a home. The family lived happily.