That must be horrible. [The Doctor knows that he shouldn't be having this conversation with his child from the future because of the past, and he will be affecting everything and anything that happens from here on out, but he can't help but feel the slightest bit guilty]
Maybe your dad should spend a bit more time with you, yeah? I bet it would be nice. Probably get's confusing for you. Must have been a bit difficult growing up... [Rambling? Yes. Why? Because maybe he doesn't want to say goodbye just yet]