Jonathan, Clark and others in “Unfinished Business”

Jonathan

There is nothing quite like watching your son grow up into a young man you can be very proud of.

Clark

It's too bad I'll never know what that's like.

Martha

Why not?

Clark

I'm from another planet. I'm not even human. Who knows if I can have kids?

Martha

Clark, your father and I couldn't have children. We were still blessed with a son. You never know what the future will bring you.