Inexcusable arrogance on the part of these parents. I, myself, had the big four..measles, mumps, chicken pox and German measles. I was five or six when I had the mumps and I still remember how painful it was. I had a dandy measles infection and spent a week in a dark room wearing my mom’s sunglasses so my eyesight would not be damaged. Diphtheria, pertussis and tetanus are all killers. I was a little girl in the 50’s when polio was a thing of nightmares. Remember iron lungs? My mom had me and my siblings in the doctor’s office the day the first vaccine became available. A point of pride with her to this very day.