Parents form different relationships with each of their children, but in most cases, their love for every single one remains the same. Unfortunately, in certain families, the adults might be more favorable toward one kid, which can affect the other children in the home.
This is what a teen experienced all her life because her parents always put their “miracle” kid first. She even got bullied by her sibling, and finally decided to leave home and cut contact due to it, which led to a lot of family drama.
More info: Reddit