As they give away part of Warren Buffett's fortune, his three children have adopted an approach remarkably similar to their father's technique for making all that money.

Like Buffett, each relies on tiny staffs. And whereas their father invests only in businesses he understands, they restrict their giving to targeted projects.

Warren Buffett doesn't direct how the foundations created by Susie, Howard and Peter Buffett spend the estimated $2.6 billion in Berkshire Hathaway stock they'll receive, but his children seem to have absorbed his philosophy.

All have focused on topics reflecting their interests.

Howard Buffett is helping farmers in impoverished nations increase harvests. Susie Buffett is strengthening early childhood education and trying to reduce teen pregnancy. Peter Buffett wants to empower women and girls through education, collaboration and economic development.