Could you form a medley relay using only blood relatives?

No way at all! I am the only swimmer in my family, except for one cousin's husband that never swam competively, but I am told that he is decent enough. Kind of sad when you think about it.... when the ice caps melt and the sea levels rise, my family is going to go extinct ;-)

Interesting results. Only about 3/5th. I would've thought there'd be more swimming families. As for my answer, I'm the only one across all generations who even knows how to swim.