If one has an adult child who is an irresponsible parent who refused to expose her child/children to education, culture, opportunities~~That person did a piss-poor job of raising that adult child! I'd say she/he can just back off and shut up. Take a look in the mirror and do some honest inventory. You reap what you sow. Where did this irresponsible, lazy adult parent come from? Thin air? Or...did you raise him/her? Too late to speak up now!
Here's a fact. The apple does not fall far from the tree, unless it happens to be a freak of nature or rotten from day one!
Very very RARE a child gets to adulthood and parenthood as a schmuck unless that's all he/she knew growing up!