Careless - She never realized how much she loved her until she lost her

When a girl named Madelyn and her family got kicked out of their home and have to live at her aunt's house with 3 of her cousins so school is the only place she wants to be. When she's at home she gets annoyed by her sister Cassie, her cousin jasmine, her cousin ben, and her other cousin Alex which is short for Alexander. Cassie is 3 years younger than her but they still don't get along. One day when Madelyn got home her sister started bothering her while she was doing her homework and told her to disappear. Then the next day there was an unexpected attack and when Madelyn tried to save Cassie she failed. She still blames herself for it and realized how much she loved her and how different life is without her.