Daddy's Little Girls

2007 movie written and directed by Tyler Perry. Monty James, a mechanic, (Idris Elba) enlists the help of a successful-but-lonely attorney, Julia (Gabrielle Union) while trying to wrest custody of his three daughters China, Lauryn and Sierra from his treacherous ex-wife Jennifer and her larcenous boyfriend. Along the way, the working relationship between the blue collar dad and his uptown attorney grows into something more.

Tropes used in Daddy's Little Girls include:

Abusive Parents: Jennifer's boyfriend beats the kids and it is implied Jennifer either wants the oldest to sell drugs or become a prostitute. The oldest is 12.
Atlanta: Takes place on the historic Auburn Avenue, where Martin Luther King Jr. once lived.
Career Versus Man: Julia has this problem.
The Danza: Lauryn, Sierra, and China Anne McClain
Don't Make Me Take My Belt Off
Double Standard: So Julia's friends have no problem with setting her up on a blind date with a 40-year-old unemployed wannabe rapper, but they frown on her dating a kind-hearted mechanic who wants to be a good father.
Evil Matriarch: Jennifer. You know she's evil when her own kids are afraid of her.
Gang-Bangers: Jennifer's boyfriend runs a drug-trafficking ring.
He Knows Too Much: Discussed Trope, the main reason the neighborhood residents refuse to report Joseph, because they are afraid he will kill them if they do.
Miscarriage of Justice: Monty was falsely accused of raping a white girl who he hooked up with at a party.
Noodle Incident: Why Monty went to jail is kind of hinted at in bits and pieces until the last 30 minutes of the movie.
Never Trust a Trailer: commercials for the film make it seem as if its going to be the typical "comedy" scenario of children pulling pranks on the person who's dating their divorced parent.
Oner: There's a long Steadicam tracking shot during the scene when Monty brings Julia home. The shot lasts for several minutes.
Parent with New Paramour
Protagonist-Centered Morality: Monty purposely hits Jennifer and her boyfriend Joseph's car and then opens the door and beats up a dizzy Joseph. At Joseph's trial, the entire neighborhood willingly testifies against him for the drug charges, but keeps their mouth shut when Monty is accused of assaulting him.
Real Life Relative: China, Lauryn and Sierra are actually sisters and those are their real names.
Roaring Rampage of Revenge: When Monty finds out his kids are being beaten, he hops in his car, finds Jennifer's car, slams into them, gets out, drags Joseph out, and proceeds to deliver a complete and utter ass beating to him.
Where Da White Women At?: Discussed, this is the reason Monty was arrested for raping a white girl.