Hi, this is Petra with the story of two exes. We are in a poly family, kids and all, that has gone through something similar. My husband's ex-fiancée Lora joined him, my boyfriend, our girlfriend and me for what started as fun sex. Her boyfriend Walter eventually participated as well. Lora liked being back with my hubby (they split because her family didn't like that he is white) and having us girls as Lesbian partners. Walter liked Lora and the opportunity to swing. They got married, but Lora decided she wanted hubby and to have his child, and us as girlfriends too. Lora divorced Walter, joined us and had David's child. When Walter has been in town we still swing with him. No problems for anyone.