A quad relationship is a type of polyamorous relationship that involves four individuals. In a quad relationship, all four people are dating each other, and it can form in different ways. For example, two couples can fall in love and decide to combine their separate families into one big family. Alternatively, a triad can turn into a quad if all three partners decide they want to add another person to their relationship. Quads can function as a single family or household unit, or they can maintain separate households, with certain partners living together, even though all partners in a quad are dating each other. Quad relationships require a lot of meticulous planning and open communication.