What secret does Maddie kept from Buck?

This week’s “9-1-1” picked up right where we left Maddie (Jennifer Love Hewitt) and Buck (Oliver Stark), with the siblings discussing the deep, dark secret their parents forced Maddie to keep from Buck his entire life: they had a brother named Daniel who died at age 9, when Buck was a baby.

What secret does Maddie tell Chimney?

In the final moments of the episode, Maddie finally told Buck the painful family secret — they had a brother named Daniel, and he died.

Does Chim ever find Maddie?

In the next episode, after learning why she left, Chimney took Jee-Yun and went to find her. They reunited in episode 12, “Boston”.