Wollongong's David McKeon finished third in the 200 metre freestyle final at the national titles, to ensure he will compete at a second event at the Commonwealth Games.
The 21-year-old touched the wall behind Cam McEvoy, who won the event in a time of one minute, 45.46 seconds.
The only Australian to record a faster time is super fish Ian Thorpe.
Thomas Fraser-Holmes was second in 1.45.58, with McKeon third in 1.46.37, quicker than the A-qualifying time of 1.47.31.
It follows McKeon's victory in the 400m final on Tuesday night, where he booked his seat to Glasgow, before sister Emma broke the Australian record in the 200m freestyle final to earn her Commonwealth Games place.
The siblings followed in the footsteps of their parents and earned Commonwealth Games team selection in Brisbane.
But the vibe wasn't so touchy feely not so long ago when David finally looked up video of his parents' Commonwealth Games heroics at the AIS library in Canberra.
"He came home pretty animated. He said 'you guys swim like s---. Technically you guys were terrible'," dad Ron McKeon laughed.
However, their father was feeling the love again after his children were the first picked for the Glasgow Games swim team within minutes of each other at the national titles in Brisbane on Tuesday night.
David, 21, claimed a third straight 400m freestyle national title by winning in 3.43.72s - the world's fastest time of the year and good enough to win 2013 world titles silver.
And 19-year-old sister Emma (1.55.68) was soon also Glasgow-bound after clocking an Australian record in the women's 200m freestyle final.
"It's one of those warm and fuzzy feelings that you get as parents," Ron said.
Despite his honest assessment of his parents' Commonwealth Games efforts on video, David did appreciate his family's legacy in the pool - eventually.
"It was only a few years ago I noticed dad's six Commonwealth Games gold medals on the wall at home - I never really saw them before," he said of his dual Olympian father.
David's grasp of his mother Susie's Commonwealth Games history seemed just as tenuous.
He admitted to having no idea that he'd booked a Glasgow berth at the same Brisbane pool in which his mother contested the 1982 Games.
But his chest puffed out when speaking about his family's heroics, which also included uncle and dual Olympian Rob Woodhouse's 1984 Los Angeles bronze medal.
"There's a great history with my family.
"It means a lot to me," he said.