2. Serena and Venus Williams

These tennis playing sisters are likely the most prevailing athletic sister duo ever.

They are first and third on the record-breaking tennis cash list (Maria Sharapova is second) and have won competitions as singles and as a doubles group.

They are aware and tasteful, both on and off the court and both have entrepreneurial and altruistic interests in their off-court lives.

Abby Wambach
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