19. Jack and his parents purchased a piece of land, with Jack tendering the down payment, and his parents taking out a mortgage for the remaining purchase price. The deed showed only Jack's parents' names, but Jack testified that they verbally agreed to split the property in half. In fact, Jack built a house, resided on, and maintained "his" half of the land for over forty years. An issue arose after first Jack's father, then mother, died. The mother left a will devising the property to Jack's brother Charles. Charles's wife then asked Jack to sign a lease in order to remain on the property. Jack sued, alleging a constructive trust had been established at the time of the purchase. Had it? Why or why not? ac at