A family in which all six siblings have PhDs (http://www.chicagotribune.com/news/local/chi-six-serenos-24-apr24,0,7679326.story).
Interesting that the Sutter Family of Hockey had six brothers play in the NHL and four of them went on to NHL coaching or GM duties. But it wasn't a 100% hit rate like your family. I'll say the hockey Sutters are more impressive as making the NHL is in most cases a more exclusive accomplishment. Plus there was a seventh brother who apparently could have made the NHL but had other commitments. The Other Sutter Family (http://en.wikipedia.org/wiki/Sutter_family)