<human>: Give me the gist of the text in a nutshell

My son is autistic, he's 6.  He likes Pokemon cards.  I let him take his cards to his after-school care because other kids also had cards and were playing during the spring break.  he started with 62 cards, and some kids gave him a few extra cards after his first couple of days.  They called these cards, "energy cards" and they are used to activate abilities on other cards, and are therefore required to be able to play effectively.  

The problem is, he just came home today with only 7 cards.  The other kids just decided they wanted his cards, and he didn't know what to do to stop them.  I told him when I let him take his cards, not to trade cards with anyone, because he wasn't knowledgeable enough about the game and the cards to trade fairly.  

I know it's not his fault for letting the other kids bully him, but I have to punish him for not following my rule about not trading.  My problem is that it's not really the Care Provider's responsibility to watch after my son's belongings, and although they have had classes about bullying it's not the kind of bullying that is easy to watch for.  The kids just said they wanted my son's cards, and he let them have them.  (According to him)

I've contacted one parent because our sons have had play dates together and she's promised to ask her son to return the cards he took, but the other parents are my concern, I don't know them, and some of the cards were "good" cards, that would actually help my son play and possibly win.  They basically took all his good cards and left him with shit...I feel terrible.
<bot>: The other kids at my son's after-school care took his "good" pokemon cards, who do I talk to?