Serena Williams has won 15 Grand Slam titles as a singles player. In addition, she has won 13 doubles titles and an additional 2 titles in mixed doubles.
Up until 2010 Wimbledon Championships Serena Williams has won 9 Wimbledon Championships 4 in singles 4 in doubles 1 in mixed doubles
Serena has won 12 doubles Grand Slams with her sister Venus.
3, one singles and 2 doubles
11 Single Titles10 Doubles2 Mixed Doubles
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Venus Williams has never won the singles final at Roland Garros. She has been in the final once, in 2002, where she was beaten in straight sets by her sister, Serena. She has, however, won the women's doubles title twice, in both 1999 and 2010 (both with Serena Williams) and also the mixed doubles title in 1998, which she won playing alongside Justin Gimelstob.
Serena has won 18 and Venus 16 including doubles
As of 2014, Serena Williams has won the Australian Open Women's Singles 5 times and Women's doubles 4. She won the women's single title in 2003, 2005, 2007, 2009, and 2010. Serena also win the Women's doubles title with her sister Venus Williams in 2001, 2003, 2009 and 2010.
Only her sister Serena Williams.