The European leader Jonathan took the Belgium title clocking 45.27 beating his brothers Kevin and Dylan, who posted 45.84 and 45.95 respectively.
All three brothers together with Julien Watrin won the European indoor 4x400m title in Prague this year in March.
Other outstanding performances produced national record-holder Anne Zagre by winning 100m hurdles in 12.87 beating Isabelle Pedersen of Norway (12.92). Zagre was also winner in the 100m with a solid performance of 11.49 seconds. Michael Bultheel won the 400m hurdles title in a new personal best time of 49.04 seconds.