Have you seen the Feldmann's journal over at crazyguyonabike.com? They did their first tour as a family back in 2002 when their boys were 7 and 10. And this year they rode from British Columbia to Newfoundland! You can find their journals at http://bikefamily.crazyguyonabike.com.

While their tour was self-supported and I think what you are thinking about is a supported tour, I imagine that the reactions of their boys to touring might be helpful.

--- Denise