Aptly, the October 4, 2009 episode of Brothers & Sisters was named "Breaking the News." That's exactly what happens in this clip, as Kitty is diagnosed with cancer.
Kitty tells her mother about her condition in this scene from Brothers & Sisters. It's courtesy of the episode "Breaking the News."

Brothers & Sisters Season 4 Episode 2 Quotes

Kitty: What if you're only here because I have cancer?
Robert: I am here because I love you.

Nora: Scotty what's going on with all this baby stuff? What are you feeling? Why are you so afraid?
Scotty: Oh, I don't know... my mother, the things I grew up hearing. I mean two gay dads... if it's a boy who's gonna teach him to bait a hook?