Name the three family members who have each won an Australian Open title?

The Kordas - Petr Korda, the tennis professional and father to Jessica and Nelly. Jessica won the Australian Open at Royal Melbourne Golf Club in 2012 and her younger sister Nelly lifted the trophy some 7 years later in 2019 at The Grange Golf Club in Adelaide.

More about the Korda's

The Korda family certainly carry some sporting genes.

Petr Korda won the Australian Open Tennis in 1998 and also reached a career high ATP ranking of 2 in February 1998.

He married Regina Rajchrtova, also a professional tennis player.

Along with Jessica and Nelly who both play on the LPGA Tour and sit within the world top 20 as of February 2021, their younger brother Sebastian has followed their parents into professional tennis, a career to date highlighted by making the 4th round of the 2020 French Open where he lost to Rafael Nadal.