Agree, he was only three! Same as climbing a tree, for goodness sake, what parent puts a three year old in a tree and expects him to climb? The FM clearly had no idea what the child’s limitations were. I believe that she was too old and too out of touch to be fostering a little exuberant boy of three.<modsnip>
Little William would still have been learning how to control his bike, and maybe not up to being confident enough to crashing it. JMO