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).
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.