Tennis stars Serena and Venus Williams have exhibited very different responses to the continuing plight of the victims of Hurricane Katrina.

While Serena has declared that she will donate £53 ($100) to the relief fund for every ace she serves tournaments until the end of the year, her sister Venus was apathetic regarding the cause.

Explaining her generous move, Serena told WENN: "Last year we were in Palm Beach when it got hit really bad. That was like a Category Two, Three maybe at the most. It was devastating down there. I can only imagine what it must be in New Orleans. I thought it would be just a halfway decent gesture. I've always considered myself a philanthropist in a little bit of a way."

However, Venus said non-commitally: "I don't really watch the news. In some ways I'm very unaware of the latest happenings in the world."

Her sister refused to judge Venus for her failure to contribute in the same way though. Serena remarked: "This is just something I'm doing. We're separate people. We have different hearts. She's a great girl, but it's up to her."