I figured this one out; the combined income of the two kids is "about $45K a year if you don't count food, iPods and designer clothes. Maybe the other two are on scholarships from the Downtrodden Woodworkers of Amerika [AFL/CIO/Dem] or don't need school because they'll inherit daddy's two businesses.
Come to think of it, according to one of the links, momma went to college to become a receptionist at a cat hospital and dada claims to be saving money by stiffing his own family on insurance, education us SO overrated (/sarc).
PS: looking at their photo all I could think of was yogurt, granola, and organic vegitables with names you can’t pronounce.