baryochai: I’d rather find someone who has older unvaccinated kids and younger vaccinated one. In today’s atmosphere about these things, the original choice not to vaccinate almost always means you already have an axe to grind. At best, I would call any statement by such parents confirmation bias.
(That being said, you’re still not providing evidence or at least an anecdote about this. You’re just telling me that this is what parents will say. At least give me a way to Google to find a firsthand testimony of what you’re claiming.)