i have always tried to focus on the eyes when i shoot people, however the only people i shoot on a regular occation are my boy's (their too young to complain lol), and they NEVER stop moving lol.
Just checked the metadata, i did shoot these with my sigma 18-200, at f6.3 and 9 respectively, which admittedly is probably too wide. my autofocus is set to the centre point and i try to focus then re-compose.
back to the old school report card comments: must try harder lol