Suggestion: As "transhumance" refers to seasonal migration in the context of livestock care (see http://en.wikipedia.org/wiki/Transhumance), and the question arises in the context of grandchildren (closely related to livestock, if I understand correctly), these people could be called "transhumans", more specifically "California transhumans".

Also, reference "orientate": In my military service (27 years), I heard this often from soldiers who acquired much of their literacy in the Army. It's simply the regular verb form created from the noun "orientation". We understand that "orientation" is a noun created from the verb "to orient" (itself created somehow I suppose from "orient" meaning "east"). Try to pronounce "orientshun". Hard. So, for ease of pronunciation we throw in the extra syllable. But soldiers who recognize the pattern of "-ation" and "-ate" from other word just apply it here.

Love your show walking to and from work.