finding the big idea in a story

The tender girl, Li Qiao, transmigrated into a delicate bride in a poor family. A rural household registration, between two decrepit houses. What she didn't know was that the unambitious loser of a husband would one day become a commercial tycoon, possessing the highest status and countless wealth. She was even less aware that her reborn stepsister was determined to replace her and become the wealthy lady of the house. The stepsister often urged her to leave, "Brother-in-law drinks and fights, he's irresponsible and doesn't deserve you." Li Qiao was irritated on a daily basis, "He says he can annoy me to death." The stepsister added, "He's too poor, you and the child will follow him to a life of hardship." Li Qiao's face blushed with shyness, "He says one child is not enough to split up over, unless we have another one." The stepsister: ……