Bree: Apology
When Chase gave information to his BFF Sebastian, Bree thought that her younger brother was stupid. When she did the same thing with Troy, Bree did not even know what to think. She only felt guilt and shame.
Everything that followed was her fault: Chase's "death", Giselle's escape, and Marcus's rise. All equal to more damage than Chase has caused in his lifetime.
Later, when Bree accidentally bumped into him from behind, she swooped her little brother in an everlasting hug.
"I am sorry."
They both knew she was apologising for more than just bumping into him.