Frederick Tilney - Captain Frederick Tilney (often referred to simply as "Captain Tilney") is the oldest sibling in the Tilney family. Unlike his brother Henry or his sister Eleanor, Frederick is a flirt and given to mischief. Austen suggests that Frederick is the Tilney child closest in character to General Tilney by identifying both men by their ranks rather than by their names. Frederick flirts with Isabella Thorpe and leads her to break off her engagement with James Morland, then abandons her in Bath.