Transmigrate to the 1970s: I Go Wild Fighting the Worst People with My Younger Siblings

[Alternate world, 1970s, sent to the countryside, golden finger (pocket dimension), unhinged heroine, family life, devoted husband, punishing scumbags and face-slapping, building a life from nothing, transmigrate into a book]

(She doesn't compete with the original leads for resources.)

The three Lu siblings have just won a lawsuit against their scumbag grandparents when their heartless uncle runs them over, killing them. They transmigrate into a period novel, becoming three siblings with the same names as the original characters, who are about to be thrown out with nothing. Their father is dead, their mother is seriously ill, and their grandparents are kicking them out penniless. Their extended family is full of awful people.

Lu Yi'an goes wild fighting her scumbag grandparents, then takes her sick mother and younger siblings and leaves the family home. She divides the household, builds a house, and punishes the scumbags with satisfying face-slapping. Along the way, she meets a man who ticks every box: he always puts her first and dotes on her unconditionally.

She has a secret of her own, and it seems her match has a little secret too.

No matter. She goes wild, and he backs her up. She takes on scumbags, and he hands her a stick. She makes a mistake, and he covers for her.

From then on, Lu Yi'an and her siblings punish scumbags at every turn: they kick their awful grandparents to the curb, beat the scheming green-tea girl, crush every vile relative, get into college, build a business, and create bright futures for themselves.