There are fewer and fewer generalists out there chiefly because that ain't where the money is and money is the real motivator for physicians. Back in the 70's a lot of people hated the way they were treated by physicians at Kaiser because Kaiser physicians didn't have time to get to know their patients or their families. Now days, with the overwhelming majority of clinicians more concerned with private wealth than public health, most physicians operate like Kaiser physicians: churn, baby, churn, gotta see enough patients today to pay for my kids private schools, my country club memberships, my multi-million dollar home, my chalet, my beach house, etc. ad nauseum.
That's why we have this predicament with kids. If the physican actually had time to get to know his wealth generators (read patients) and their families, the physician could use his own judgement about whether or not anything should be said to the parents. But time is money and practicing medicine is almost exclusively about the acquisition of wealth for the clinician. The days when your physician actually knew or cared about your family (except for how much money they could make from you) are gone forever. Patients are "consumers of healthcare" in the modern paradigm, and physicians are merely hawkers.