An elderly Perth widow invited her niece to leave the Philippines to come to Australia. The plan was for the niece and her husband to move into the widow's mansion to keep the Widow Company for the remainder of her life. The couple was promised that the entire widow's property (a substantial amount) would be willed to them. The niece left her lucrative acting career, and her husband resigned from a high government position, to make the move.

After a few months of sharing the house, the widow became annoyed, ordered the niece and her husband to leave, and changed her will, leaving everything to the various charities.

Can the couple take court action to enforce the agreement with the widowed aunt? Support your answer with a relevant case. Use the IRAC method to answer the question.