Simpson, married to his childhood sweetheart for almost 19 years, had walked out on his wife and kids and into the arms of a younger woman. The breakup surprised his wife, his friends and even Simpson himself. Looking back, he says, it was a classic midlife crisis.
In that we have already provided the definitive answer to this question elsewhere (relying on rum extract), we assume your follow-up is seeking a non-alcoholic substitute for rum (as extracts can be as alcoholic as or more alcoholic than the spirits they replace).
Use the same amount of maple syrup as vanilla extract. If you use vanilla bean, scrape half of a vanilla bean for every tablespoon of vanilla extract. When you substitute liquor, such as brandy or a liqueur, be sure that the flavor of the substitute does not compete with the rest of the recipe ingredients. Do not use more alcohol than you would have used vanilla extract.