Maybe they did but there were never long term health consequences. I know my mom told me her 2 best friends got polio but even thought she was around them she never got it. Her mother did use herbal medicine and limited sugar which apparently had a profound affect on polio cases. Neither of my parents where "isolated" If you don't have young kids you don't understand the huge push to jab your kid with ever imaginable "vaccination" Also the difference is that lots of kids are wear housed in "daycares" and have constant colds yet have to be vaccinated on almost a monthly schedule. Their poor immune systems are overwhelmed
Said now adult child of mine, has had my grandchild vaccinated, so don't tell me what I do or do not know about.
As I stated earlier, not everyone, born prior to the polio vaccine, got polio; however,many did, as your story about your mother proves. And sugar has nothing at all to do with getting polio! How do I know this? Because I remember several babies getting polio, when they were less than 6 months old, way back when. These children lived in the neighborhood and I didn't get polio either and since my mother was friends with two of the mothers, I was in and out of the houses, before it was known that the babies had polio.
Human immune systems are impacted by our modern day uber cleanliness streak, with parents constantly using anti-bacterial soaps of their kids, children not out and about as children used to be, and being exposed to viruses brought to this nation by foreigners; both legal and illegal.
Neither of your parents ever had the "normal" childhood disease? That's abnormal, because parents used to expose their kids to them, the younger the better, they thought, so that they would get them and be done with them, as soon as possible.
As I said, vaccines for smallpox was required in order to attend school ( and yes, you had to bring a doctor's note with you, to register a child ) for both of your parents and there was also a whopping cough vaccination, back then.