You're curious and you want to help. [ He offers a smile, and there something comes from it. Something like actual emotion rather than simply smiling to smile for another person. ]

I believe you'll be able to come up with something, or see something that has not yet been noticed by others -- even if it is outside your area of expertise.

[ A pause as he drinks down more of the coffee. And he looks up over the cup. It is carefully set back down on the table. ] Your not-quite sister?