One of my mum's sister's died, aged 10, from diphtheria back in the 1930's. There was no vaccine until the 1940s. Her sister died in agony, not being able to swallow. My mum was sent to her friend's house because diphtheria is so contagious. Mum remembers the doctor running down the street yelling 'Mrs X, get the children out of the house, get them out'.
My aunt (though I never obviously knew her) died because her best friend, unbeknown to everyone including herself, was a carrier. She never became ill but a test showed she was carrying diphtheria. They had shared an ice cream a week or so before my aunt became ill. Can you imagine how that poor child felt?
My mum had all of us vaccinated and we've done the same with our children.
The mum of one of my son's friends is profoundly deaf in one ear and has learning difficulties which she was told was a result of contracting measles when she was ten. Up until then she was hitting all her development milestones.
You may well find people who haven't vaccinated who have healthy children. It doesn't mean they will stay healthy (fingers crossed they do) though so the conversation is a little pointless. It's a bit like asking 'does anyone know someone who's lived a long life whilst smoking 60 a day'. We can probably all find someone, somewhere who fits - but would we do it ourselves...