Dan Duncan is a self –made billionaire. He struck it rich in oil, natural gas and petrochemical pipelines. When he passed away in 2010, he left nearly $10 billion estate to his four children. The family fortune has since grown by approximately $15 billion.
S. C. Johnson founded Johnson’s Prepared Paste Wax Company in 1886. His son Herbert Fisk Johnson inherited the company and ran it till he passed away in 1928. He died without a will. The estate was divided between his two children Herbert Fisk Jr and Henrietta Johnson Louis. Herbert Fisk Jr’s grandchildren run the company today.