Alaina Koput ( 10 ) saw a 9.34 - second drop in her 100 breaststroke race .
Alaina Koput 's sister , Aliza ( 10 ) , shaved off 2.16 seconds Alaina Koput 's her 50 freestyle race .
Alaina Koput ( 10 ) saw a 9.34 - second drop in her 100 breaststroke race , and her sister , Aliza ( 10 ) , shaved off 2.16 seconds in her 50 freestyle race .