heart child

A heart child is a term for the younger siblings (don't call yourself a heart child if you're older than one of your siblings.) Who's parents usually spend more time on the older ones who are considered special/smart. They think of leaving their family but they also think it'll hurt them too much(emotionally/mentally). So they hesitate to leave.
They try to one up their older sibling too, in which they usually fail to do so.
A reason why they might hesitate to leave is because of a person in their family they care deeply about and may or may not be their sibling.

*mother and heart child fighting*

Heart child: you're always cooped up with (insert sibling name).

Mom: no I am not!

Heart child: you forgot to pick me up from school like how many times, you also forgot my birthday, and you never attended to anything that I did that was special to me.

Mom: quit being dramatic and go to your room!
*Later on*

Heart child: I want to leave this family, but won't it hurt them?..