So during Summer and Autumn 1795 Napoleon is constantly writing to Joseph letter after letter asking his brother to help him to overcome Désirèe’s family resistance to their marriage. Joseph does nothing (or virtually nothing). Then Napoleon meets Josephine and you know the rest.
In Egypt, when he believes she’s cheating on him and writes to Joseph, he asks his brother to search a country house for staying there after his return and to help him with the divorce (it must be said, however, that he also wrote letters in which asked him to treat Josephine kindly). Joseph does nothing (or virtually nothing). Then Napoleon returns and there’s a reconciliation.