A modest proposal:

I was recently researching my family tree, which led me to find a grave website. I was a little shocked to see how many members of my family had perished at a young age due to Measles, Whooping cough, etc. It gave me an idea.

Start with prominent Antivaxer. How about Jonathan Spence Stickland who is quoted as saying vaccines are "sourcery" (pic related)

Research his family tree and find all relatives and keep counts of how many died on his and his wife's sides. Got back as long as you want. Sometimes you can find quotes about the family hardships.

Put that info out on the interwebs. My guess is that some online news agency will pick it up.

Repeat as needed.

Hold my beer, I am going give this a shot and will post results here. Any other suggestions on other prominent Antivaxers or help with this mission appreciated