Mr. Wentworth[1] is a character mentioned in Persuasion, and he never appears in the book. Wentworth is a sibling of Captain Wentworth's and Mrs. Croft's. He is the curate of Monkford estate in Somerset[2], which earns him the disdain of Sir Walter's. The curacy was the reason that Captain Wentworth stayed at Monkford in 1806, developing an affection for Anne Elliot.
He is married by 1813, according to Mrs. Croft. Anne is relieved that Captain Wentworth was not the brother who married[3].