Thanks for that article. I guess that explains why there was a period there where we did indeed catch everything. It all came before I was about 8 or 9, and I'm the oldest of the four (the youngest six years younger than me). First came measles, then chicken pox, and then mumps. I remember mumps best because it was most recent, but I had a really dreadful case of it, missing a couple of weeks of school. I seem to also recall my father was away for the mumps, in particular, staying with a friend because he'd never had them as a child, so that left four sick kids on my mom's hands alone. Mumps in adults.