Eva Maria Braun-Luedicke and Friederike Braun-Luedicke

Age: 34, 37

Net worth: $1.4 billion each

Citizenship: Germany

Source of wealth: Medical technology

Eva and Friederike own 12% each of the medical device company B. Braun Melsungen, which was started in 1839 as a small pharmacy selling herbal remedies. Today, with more than 64,000 employees globally, B. Braun manufactures products ranging from infusion and injection solutions to surgical instruments. Their mother, Barbara, is a member of the company’s supervisory board. Their mother’s cousin Ludwig Georg Braun took the reins in 1977 when the company had just $24 million in annual sales.