My father was born in 15. He had 9 siblings. My mother was born in 17. She had 8 siblings. Each family lost 1 or 2 kids in childhood. I wonder if that flu took any of them.
Perhaps, although as I recall, the hardest hit demographic were young adults with strong immune systems. I just checked the wiki article about it: “Modern analysis has shown the virus to be particularly deadly because it triggers a cytokine storm, which ravages the stronger immune system of young adults.”