Big Girls Don't Cry... They Get Even (1992) on Netflix

If you think your family is messed up, then you better take look at Laura Chartoff's life. Her parents divorced when she was 8, following both of them remarrying. Living with her mother, Laura endures her materialistic step-father Keith, her vain step-sister Corrine, her militarily obsessed step-brother Kurt, and her far too serious/far too smart half brother Sam. Laura's father is no help, currently the middle of a divorce with his wife Barbara and barely seeing his little daughter Jessie due to the fact that his mistress Stephanie is about to have twins. The only relative Laura gets along with is Keith's eldest son Josh, so when her relatives becomes too much for the 13 year old to handle, Laura runs away to his cabin. When the entire clan comes to track her down, she runs again, thinking her step-brother betrayed her. While her family finds common ground in their worry over her, Laura experiences life on her own and realizes her family may not be so bad.