A nephew, who was male, was related to Councilor Jon Wittick in the time of the High Republic Era. In 231 BBY, while Nihil Tempest Runner Lourna Dee was held captive on the Galactic Republic prison ship known as the Restitution, Wittick informed Dee that he had intended to go to the Valo Republic Fair to visit his sister and her children. Wittick's nephew, her son, was very enthusiastic to see the research ship called Innovator, but earlier in that year, it was destroyed in a Nihil terrorist attack that resulted in the deaths of hundreds of thousands of people. Dee, unbeknownst to Wittick, was the leader of that attack.
Cavan Scott wrote the 2021 audio drama The High Republic: Tempest Runner, which featured Jon Wittick's nephew and was performed by a complete cast of voice actors.