My Dad is the Male Protagonist in a Stepmother-Era Story

By chance, Zhao Suisui learned that the world she lived in turned out to be a chronicle period.
The male protagonist is her biological father, but the female protagonist is not her biological mother.
According to the plot, her biological mother will die during childbirth a year later.
It won’t be long before her father marries another woman and becomes her stepmother.
The daughter brought by her stepmother robbed her of everything. She and her brother would be rejected by all their relatives, and eventually, they would be kicked out of the house and live on the streets.
However, all the children born from her stepmother have become the best among people.
***
After half understanding all this, four-and-a-half-year-old Zhao Suisui clenched her little fists.
She must defeat her scumbag father and stepmother and protect her mother and brother!
***
Zhao Haoyang had been looking forward to the stars and the moon, and finally, his wife came with his two children to join the army.
He thought that he could finally live a good life with his wife and children on the hotbed, but soon he discovered that there seemed to be something wrong with the attitude of his wife and children toward him?
Until one day, he accidentally overheard his most adorable daughter speaking the most devilish words to his wife in the softest voice—
“Mom, when will you divorce Dad? Brother and I will follow you!”
Zhao Haoyang: “???”
They say that the daughter is a caring little cotton-padded jacket, but how come his little cotton-padded jacket still leaks air?