Younger sister Laiken ( 12 ) tried hard .
Younger sister Laiken ( 12 ) gained valuable racing experience , while seven - year - old Nash improved his entry times in four events , stripping 10 seconds from his best in the 100m freestyle .
Younger sister Laiken ( 12 ) tried hard and gained valuable racing experience , while seven - year - old Nash improved his entry times in four events , stripping 10 seconds from his best in the 100m freestyle .