I've always found the reflexivity of class to be somewhat interesting. Economically, my family is in the bottom quartile of the country—but it never felt like that. They definitely raised me with "upper class" values and attitudes. (For example, there was never even a shadow of a doubt about whether I'd attend college.) My grandparents, on the other hand, were quite well off.
As such, I've always felt more comfortable and fit in with people whose families have incomes vastly exceeding my family's.
Wouldn't this actually meant that the average of one's parents, grandparent's, and great-grandparent's income quintiles is a better predictor than one's parents alone? (Unless these studies only looked at personal income of male relatives instead of household income?) The income of the grandfather is still a single point subject to fluctuations.
Where are these studies?