The Plymouth-based swimmer won the 50m butterfly in 25.71sec. and breaststroke in 28.96, plus the 100m equivalents in 56.32 and 1-04.59 respectively.
Currently in heavy training, he qualified for the 200m breaststroke final but pulled out to concentrate on other events.
Meanwhile, younger brother Ronny swam at the Swansea Aquatics long-course qualifier amid a heavy training block of his own.
The Mount Kelly student posted a 50m butterfly PB of 27.84 and just missed out on bronze in the 50m breaststroke, clocking 30.18. He placed fifth in the 100m breast with 1-07.43.
Both now look forward to the British Championships in early April.