Serena and Venus are related through their mother and father. Oracene Price, their mother, had three children from her first marriage to Yusef Rasheed. The two younger sisters were born in 1973 and 1975. When Oracene married William Thomas Jefferson III, he had one son, John Paul Jefferson, from his previous marriage. John Paul was adopted by his grandparents, William Thomas Jefferson Jr. and Martha Clementine Graham Jefferson.
Venus is the elder sister who played professional tennis from 1995 to 2009. She is also the more successful player of the pair, having won eight Grand Slam singles titles compared with Serena's seven. However, it's Serena who has the edge when it comes to winning overall majors: Venus has four Grand Slam doubles titles to her name.
They both attended Stanford University, but only Venus continued playing tennis after graduating in 1996. She went on to win the Australian Open in her debut year on the tour, becoming the first woman to do so.
After losing out on a place in the world's top 10 to Martina Hingis, Venus made a comeback in 2001 by winning the French Open. This was followed by another title in 2002, which took her career tally to nine wins.
Venus and Serena are the only two daughters of their parents, Richard Williams and Oracene Price, but both have children from other relationships. We wanted to learn more about their lesser-known siblings because both sisters have spoken about their love of family in the past. Here's what we discovered.
Serena's sister Lynda is also a tennis player. She was born on January 4th, 1969 and had an extremely successful career as a professional tennis player. She won four WTA singles titles and one WTA doubles title during her career. As of 2015, she is ranked No. 7 all-time by the Women's Tennis Association (WTA) for prize money earned.
Lynda Williams started playing tennis at the age of 5. By the time she reached high school, she was competing against college students. She went on to play at Clemson University, where she met her husband Steve McIntosh. They married in 1987 and have three children together: Lincoln, 10; James, 8; and Lucy, 6. The family lives in South Carolina.
After graduating from Clemson, Williams turned pro in 1988. That same year, she received her first national championship when her team captured the NCAA title. Three years later, she became the first woman to win the Australian Open while being world number one. In 2004, she finally won her fourth WTA singles title at the age of 34.
Price and Williams have the same mother but separate fathers, while Serena and her sister Venus are Richard Williams' kids. The family business was built by their grandfather, who was known as "The King of Clay." He died in October 2006, at the age of 73, after suffering from bladder cancer for several years.
Richard Williams started out working with his father at the family business before launching his own tennis career. He became one of the best players in the world during the 1970s and '80s, winning three Grand Slam titles. He also has five Olympic gold medals to his name.
After retiring from tennis, he went on to work at the family business until 1995, when he moved away from Chicago to start a new life in Florida. He still visits his sister and niece or nephew every year at Christmas time.
As for Serena's dad, he was born Ernie Price and he used to play baseball and drink beer with his friends after school. One day when he turned 15, he saw John William Williams playing ball down the street with some other boys. He asked the boy if he could join him, and since then he has been helping out at the family business during the off-season months.