My farther died ten years ago leaving his comfortable estate to his much younger wife. His will states that once his widow re-marries, dies or sells the (large) house, his 5 children are to inherit 1/3 of the proceeds of the house sale divided equally. His widow is the beneficiary of everything else. His widow re-partnered within 18month of Dad's death. She has lived in a de facto relationship with this man for the past eight years. Throughout this time they have lived together in the aforementioned house. She will not marry her de facto and when approached about the unfairness of this arrangement, she says she will break up her relationship rather than settle matters with her step-children. Is there any point in we five children perusing our claim on Dad's deceased estate and inheritance or is this a hopeless catch 22 where his widow will retain everything regardless? She is not much older than we are.