Sure, that's possible.

One issue they had was their kids stayed up too late, didn't get enough sleep and screamed a lot near the end of the day. They were late to school (in elementary level) because the parents were tired too.

I think this is objectively bad parenting... but I could be wrong.

Edit: since I got one down vote let me add > they scream at their kids regularly (daily, sometimes the normal tone), let them play video games endlessly without supervision, and many other odd things. Kept a dog in a crate permanently in the house where it crapped and screeched at everyone. The list is long... Look at my other comments, I don't want to keep piling things on, but do some pretty outlandish things as parents.

sounds like wrong because different

Well, I should probably not have said "objectively", but we were comparing against the article titled "how to parent more predictably"... so I felt that was a fair assessment.