While Jobs and Brin had middle-class upbringings, Musk's father was quite wealthy: he had a large and successful engineering business (South Africa's equivalent

While Jobs and Brin had middle-class upbringings, Musk's father was quite wealthy: he had a large and successful engineering business (South Africa's equivalent of Tutor-Perini, the multi-billion dollar construction company that built the ports of LA and Long Beach and much of its metro system among other projects) and was a millionaire before he was 30.