A cutesy family pic mixing relentless cheer with jarring notes of pre-fab gloom, John Sheedy's H is for Happiness watches a precocious preteen do her best to cure her family's emotional woes and help a new friend experiment with theoretical physics. The Australian debut film has more than enough commercial gloss to suit families who stumble across it while surfing video options, but it's unlikely many Stateside viewers will seek it out.