TheChaoticBox
Rookie
Don't forget, we know these characters in the context of their workplace. Talking about one's dead sister isn't exactly water cooler conversation, and maybe I'm the only one here, but I thought it was completely natural that we didn't know about Jo's sister until now. Her death was clearly a very traumatic event, and while Jo might have told Mac or Lindsey about it outside of work at some point, I don't see see much of a situation were we would have found out until now.No, I don't ever recall there being a mention of her sister. I think these writers just come up with these things and don't think about what was said or mentioned in the past. Like Flack's brothers, we never heard about them in the past episode and when we saw the letter it was just Don and Sam.
I completely agree with you. And in hindsight, it might explain a lot about Jo's character. For example, Jo's reaction to Sid's confession - "promise me you are not telling me goodbye". Of her full-flat panic attack when Mac was fighting for his life.