Claim: Serena Williams is the younger sister of Venus Williams.
Evidence: Venus Ebony Starr Williams -LRB- born June 17 , 1980 -RRB- is an American professional tennis player who is generally regarded as one of the all-time greats of women 's tennis and who , along with younger sister Serena Williams , is credited with ushering in a new era of power and athleticism on the women 's professional tennis tour.