Oh my gosh! What a shock that must have been! I would have panicked, too. I have the Poison Control number on my fridge and have had to use it once. I will keep him in my prayers and pray that all goes well for the rest of the 12 hours. They said you couldn't induce vomiting or give any other help at all, other than to just watch for symptoms???
Please let us know how he is. Your poor mother must feel really bad.