The distinguished legal historian Laura Kalman is seeking information on families of law professors; she is interested in "a list of families since 1870 in which parent and child/child's partner; grandparent, parent, and child/child's partner; parent's sibling) and child/child's partner; or just plain-old siblings are all law professors."
An example would be Richard Posner, longtime Chicago professor and now judge, and his son, Eric Posner, now a Chicago professor. Another example: Frederic Kirgis at Washington & Lee, and Paul Kirgis at St. John's.
I've opened comments for others to post examples. Professor Kalman will check the comments periodically to see what folks come up with.