When a single parent marries (or remarries), issues such as divided loyalties, the right to discipline, favoritism, and financial responsibility can prove to be volatile. Peggy, a single mom who has had sole custody of her 12-year-old daughter Sarah for 10 years, recently married Tom. Tom has never been married and doesn't have any children. Provide examples of each of the three basic forms of relations (mediator, tertius gaudens, and divide et impera) that could emerge in this newly formed triad.