You did much better than I would have. Given a choice between the kid, the mom, or a bus stop, I would have chosen to collide with mom because mom would be more elastic than the bus stop and mom is probably less breakable than the child.
well, i didn't really have much time to decide... the kid was just suddenly there... there's also a slight raised divider between the bike path and the pedestrian path, so to have hit the mother instead of the kid i would have had to cross this with the brakes full-on which might not have been a good idea. it's only about 5cm (2") high, but with both brakes on and from a side angle it could be a problem... hitting the trash can or bus stop would have been way worse! for me personally it would have been best if i had just moderately braked and slammed into the kid... but then the kid would have been hurt i think as i weigh 73kg...