I'd be shocked if someone from my past appeared just like that. I can imagine how shaken you must be.

One thing I like about e-mail is that you can think about messages and don't have the pressure of replying instantly, like you would if he had called you on the phone.

I would contact him and say how you're feeling awkward about things and don't really know what to say to him. He'd probably be rapt to learn that he's got a great-grandchild if he doesn't know about Jaden