In reply to T1bster:
I agree with the suggestions made so far.
I was out at Hound Tor yesterday with my 3 year old and we had a great time. Just letting her set the agenda and letting her get excited by the experience.
For under 10's there are lots of options away from some of the more common climbing areas. Great Staple Tor, Great Mis Tor, King Tor, Honeybag Tor, Sharp Tor, West Mill Tor etc... Any of them will have bouldering options and short roped sections for them.
Try the traverse of Grea Tor (5 mins walk from Hound Tor) from SE to NW. This is a lovely little adventure for kids and allows them lots of options to explore.
Have fun.
Post edited at 08:31