Hawaii Five-0, Season 5

[Danny's ex-wife Rachel tries to tell him that her son, Charlie, is suffering from HLH and needs one of his parents as a bone marrow transplant donor]

Danny:
Why are you telling me this? [catches on and looks at Charlie] That's my kid? [sees Grace staring at him] How long have you known this, Rachel? You've always known.

Rachel:
Danny, I...

Danny:
Why would keep something like this from me?

Rachel:
Because your life, from the chances that you take.

Danny:
The chances I take?

Rachel:
See, if anything ever happened to you, I didn't want two kids growing up without a father.

Danny:
You had no right to do that. You understand that? You had no right to keep that from me, that I got a son. [looks away despondently]

Rachel:
I know that you hate me right now, and I don't blame you for hating me, but I am telling you now. We have a son, and there is something wrong with him, something that could kill him. He needs our help.

Danny:
Okay. Okay, so what? So, what happens now?

Rachel:
You need to take a blood test. It won't take long, only a few minutes... 24 hours to get the results, and then the doctors can decide how to proceed from there.

Danny:
And then, they set everything up then?

Rachel:
Yes.

Danny:
What about Stan? What does he know?

Rachel:
He knows now.