Things they didn't tell you more about growing up with parents that live separately is how their children will have more than one home to come to. They're always stuck in between, and going back and forth. Leaving the room they grew up in (the only place where they feel belong) behind, and constantly on the move. No one really talked about how any one of the eldest children are forced to be mature at such a very young age to nurture their younger siblings - and selling off their childhood because of that. Growing up in their mid twenties, they feel like the life they're living in does not fulfill their needs. By 25 they probably feel uncomfortable, they feel somewhat childish whilst having a mature body. They wants to play like a child, getting piggy backs like a child, getting their forehead kissed like a child. But those things that they're supposed to get when they were a child were absent, because they were already matured back then. 

These grown children are also forced to take the parents issues & drama as theirs. While juggling between studies, work, (let alone) play, they have to take up the role of a mature adult to calm the other two adults when they are conflicted while protecting the younger siblings.

And just like that, they don't know their actual place, where they can feel belong. Because they spent years of growing up making everyone else feel at home and find their home while they are stuck in the elders' problems.