http://www.freezepage.com/1141830850HTXWSPWCRK Yaknow.... First off. Neither of them bought the cup of coffee, so neither have any more right to it than the other according to what the Tim Horton official said. HOWEVER this is my take on it.
Child #1 grabbed a cup out of the garbage. As refuse it had no owner. This could be legally established in court. By taking it that is a claim of ownership, unless it was retrieved under orders of another person. It was not according to this story.
Child #2 was asked to roll the rim as child #1 couldn't. There was no mention of any agreement of sharing a potential prize, or compensation for services rendered, therefore girl #1 or her family are under no obligation to share in the rewards if they don't want to.
Example.
I ask someone on LJ to pick 6 numbers between 1 and 49. Someone does. I play those numbers in the Lotto. I win. There is no legal grounds or precidence that I would have to share one cent with anyone UNLESS, before doing so I said "If it wins I'ma gonna hook you up with so grade A coin" or something to that effect. Now I'd be on the hook as the person suggesting numbers now has proof of a verbal contract/commitment of compensation.
The mother of Girl #2 should be ashamed of herself. She has degraded and belittled the good deed of help and friendship that her daughter did, by helping a smaller, younger schoolmate. In time, I don't doubt Karma would see that kid rewarded in some form or other, but by her Mom's actions, now its just an embarassment.
/end rant