"Family of 5 raking in £52,000 a year on benefits, no one working"
He didn't say that no-one was working. He didn't say anything about the parent(s) or name the benefits being paid.
"I think there were three or four of the children were labelled as having ADHD which I didn’t believe because a lot of people play on that"
From NHS England, "Diagnosing ADHD in children depends on a set of strict criteria. To be diagnosed with ADHD, your child must have 6 or more symptoms of inattentiveness, or 6 or more symptoms of hyperactivity and impulsiveness."
I would be willing to bet the MP was not qualified to give such a diagnosis.