His fortune is 100 billion dollars… Why does billionaire Warren Buffett refuse to be inherited by his children?

American billionaire Warren Buffett is, so far, halfway towards his goal of donating his vast fortune, but although he still has $100 billion left to donate, he doesn’t plan to share it with his children.

The investment legend has consistently reiterated his firm belief that his “incomprehensible” net worth is better spent on philanthropy rather than the investment portfolios of his sons, CNBC reported.

“After so much supervising ultra-wealthy families, here’s my advice: leave enough for the kids so they can do nothing, but not enough so they can do nothing,” Buffett said in a note to shareholders earlier this year.

He added that his adult sons pursue charitable efforts that involve money and time. Buffett describes his philanthropy as “the easiest job in the world” because “giving is painless and may lead to a better life for you and your children.”

The 90-year-old says he has noticed that inherited family behavior, or the transmission of vast wealth from one generation to the next, is less common in the United States than in other countries, and that he thinks his appeal will likely fade.

This does not mean that Buffett’s sons, now in their 60s, did not receive anything from their father. The Washington Post reported in 2014 that each son has a $2 billion foundation that Buffett funds.

Buffett announced in his memo that he has donated $4.1 billion of Berkshire Hathaway stock to five charities as part of his effort to give up 99 percent of his fortune by the end of his life, bringing his total donation to $41 billion.

The investor, who was once the world’s richest man and currently has a fortune of more than $100 billion, plans to distribute his remaining 238,000 shares to charitable causes.

Buffett first announced his plan to give up the vast majority of his fortune in 2006, when he was 75 and owned 475,000 shares in Berkshire Hathaway.