After Chris's death, Sarah blames herself, and her dad is shown trying to console her.
After Chris nearly rapes Sarah she runs to Nancy, Bonnie and Rochelle for help, and they comfort her about it. Made more heartwarming by the fact they had an argument earlier.
Even though we don't see much of her, Nancy clearly gets along with her mother. This is shown when Nancy gives her step dad a heart attack because he was about to hit her mother. While he was having said heart attack, Nancy can be seen checking if she is alright.
There's also they're happy excitement when they realize they are insured for 175000 dollars.
Even though they barely know each other, the shopkeeper willingly helps Sarah when the other girls turn on her. Her interactions with Sarah were borderline maternal.