My sister called me today and asked me if I could help her out with a little situation. She has a 3.5 year old son who is not potty trained. He insists on wearing diapers. They joined a play group and he is the only one wearing diapers. If he has an accident during the play group how should my sister handle the situation?? What should she tell him about going in his diaper??? Where should she change his diaper?? Should she change him lying on the ground or while standing...