The New York Times has a fascinating article out showing how likely people in certain professions are to have a parent in who had the same job. For example, the child of a doctor is 19 times more likely to be a doctor than a random person. But that's a small effect compared to what prevails in fishing; the child of a fisherman is 362 times as likely to be a fisher as a random person. Some other professions:
Fishers 362x as likely
Textile machine operator 159
Medical and laboratory techs 126
Aircraft mechanics 118
Printing press operators 91
Human resources managers 78
Textile machine operator 75
Packaging machine operators 39
I was really surprised that there is a big effect for human resources managers; why would that be?
More data at the link, sorted by the effect of mother vs. father. It's fascinating to see how strong these patterns are in our allegedly free world.