The glass castle

I am writing an critical essay on The glass castle and was woundering if the theme of “forgiveness/

mistake are meant to happen to learn from them through forgiveness “ is good?

I was looking for 3 theatrical elements for this theme and 2 explanation to prove it.

any theatrical element who is shown by the autor by the theme.

I am looking for 2 evidence which proves why this theatrical element is seen through the theme