THE MacAuley sisters from Kent College in Pembury excelled at the National IAPS Championships at Dulwich Prep School.
Their sibling success is reminiscent of the Brownlee brothers Alistair and Jonathan, who won Olympic gold and silver medals in the triathlon at the Rio Olympics last year.
Children from Years 5-8 competed at various distances according to their age groups.
After swimming 140 metres, cycling 2km and running 1.2km, nine-year-old Grace MacAuley won her race in time of 16min 20 sec to take home the Under-10s title.
Later her sister Ellie, aged 11, won the Under-12 category – she swam 200m, cycled 4km and ran 1.8km – in a time of 22min 67sec.
The Independent Association of Prep Schools triathlon had 440 competitors overall from 67 schools.
Alice Elmer was also competing on behalf of Kent College.
The Headmistress of the independent girls school, Julie Lodrick, said: “What an extraordinary achievement from Alice, Grace and Ellie.
“We are extremely proud of them, and delighted that we have been able to support their sporting development.”