Interesting question. Close to fightin' words around here.
Lots of old associations with pork due to religion, cultures, and previous incidents of trichinosis. Nowadays, trichinosis has been virtually eliminated in commercial food chain for pigs. Home grown pigs have a much higher incidence of trichinosis.
There's all kinds of stuff on the Internet about pork and whether it is healthy or not. About the only study I found interesting was the study of how red blood cells acted when eating fresh pork compared to marinated or cured pork. With fresh pork, according to the study, red blood cells tend to "aggregate," kind of like a loose clot, and results in inflammation. That didn't happen with the marinated and cured pork. The "study" wasn't very broad though so I don't put much weight on it but it was interesting.
My advice? Serve beef to the older relatives and enjoy pork when they aren't around.