answer:1) let the kid whine. Especially over something like whether he gets a Coke or not. Kids can learn disappointment and that they don’t get everything. 2) I would have told the mom that it would be inappropriate to do one and not all, and that you appreciated her gesture, but no thanks. The other kids are your responsibility, and all of them have been entrusted to you because of your experience and judgment. I would have thanked her for her concern, and I would have turned down the money for her kid’s coke, and I would have continued to do what I you thought was right.