This sibling fled the moment they turned 18. They built a life elsewhere, often with more money and sophistication than the rest of the family. They return for the trigger event believing they are "above" the family dysfunction, only to realize they are the most fragile. Their drama comes from the conflict of wanting to save the family but refusing to rejoin it.
Using multiple points of view reveals how the same event—like a parent's absence or a sibling's mistake—is interpreted differently by each member, creating layered irony. Anal Incest -1991- - Italian Classic -
Modern works frequently use family complexity as a central literary device: Malibu Rising This sibling fled the moment they turned 18