Love 'Em and Leave 'Em (1926)

Mame Walsh promised their mother on her deathbed to look after little sister Janie. But Janie helps herself to everything of her sister's, be it her clothes or her men - even the money entrusted to her by fellow employees at the store they work at. Regardless, Mame can't break her promise. So when it comes to getting Janie out of trouble, big sister comes to the rescue.