Harrison Tisdale is a character portrayed by Brian Avers in the ABC crime series Castle. Harrison was the brother of murder victim Allison Tisdale and the son of self-made millionaire industrialist Jonathan Tisdale. Although Harrison had made his own money in auto-repair while Allison worked as a social worker, he was rapidly approaching bankruptcy, and was unable to get financial help from his father, as Jonathan apparently perceived his son’s need to ask for money as weak.