Definitely no comparing to other kids. Also, I find that kids that age who go through an illness often do regress, even through parents/caregivers best efforts. He is two, he is still young and there shouldn't be so much pressure and hurry to get him potty trained, although it does sounds like he was doing really well with you. I would lay off the potty training for now until DCB comes around again and then when he feels like going potty again pick up where you left off and continue with the great progress you've made. Don't let their laziness get to you! It's too bad these parents aren't appreciating you and their sons efforts. Too bad there isn't a cure for stupidity!