In Trinidad and Tobago, a husband and wife can legally end their marriage by obtaining a divorce based on the ground that it has 'broken down irretrievably'. To file a petition at the family court, proof of irretrievable breakdown must be provided, which can be demonstrated through various criteria such as adultery, unreasonable behavior, separation, or mutual agreement. The process includes obtaining a 'decree nisi' followed by a 'decree absolute' after six weeks, with considerations for custody and property disputes handled separately.