Transmigrated Into a Vicious Mother-in-law in historical novel

Su Tian traveled into a book.She was reborn as the mother of the scumbag male protagonist, and helped first love of her son abuse the female protagonist .Thinking of her own frustration at not being able to slap someone in the novel while reading, Su Tian rolled up her sleeves and slapped her eldest son, who was asking to marry first love as his concubine. "Pa!"The eldest son was stunned: "Mom, you hit me?"Su Tian : "You favor your concubine and kill your wife, and the one I should be slapping is you!""?"As soon as the second son rescued the junior sister from the water, Su Tian slapped him—"Pa!"The second son was confused: "Mother?"Su Tian : "Who told you to leave your pregnant wife behind and save another woman?! I can't wake you up even with a slap!""?"The youngest son took his bride forward and was about to introduce her joyfully, "Mother, tao tao is the girl who saved me on the battlefield..."Su Tian slapped him mercilessly again—"Pa!"The younger son was confused: "Mother?"Su Tian: "Even lifesaver you found is wrong . If I don't slap you, who else can I slap?""?"midnight.The Marquis held the divorce agreement, puzzled."Butler, I don't have a concubine, I don't have a junior sister, and I don't have a lifesaver... Why does my wife want to divorce me?"