So you were on here looking for advice YOU wanted to hear. Gee...like that hasn't happened here...today!
Nobody was bashing you -- you were being asked very SERIOUS questions -- including by Seniorjudge -- who certainly knows more than never-will-be-a-lawyer-LdiJ does. This site isn't an emotional support group and dealing with support issues, especially given the fact that you and the ex agreed to NO support, then you are filing for a mod within 2 years when there is really no significant change in circumstance (and you moving along with the ex allegedly bailing out of an alleged verbal agreement does not constitute a significant change in circumstance). If you thought people were bashing you, you're in for a big surprise when you're in front of a Judge. Because a Judge will ask you just as stern questions.
What his parents do/do not do for him is irrelevant and has absolutely no bearing. Parents have the right to give their child whatever they want. And your ex is seriously misguided thinking he doesn't have to financially support his children. You're just being told -- nobody here can tell you exactly what to expect -- including LdiJ
-- just be prepared for it to go either way.