Decedent Joan Jones, a bedridden, lonely woman of eighty-six years, owned outright Greenacre, her ancestral estate. Biggers, her physician and friend, visited her weekly and was held in the highest regard by Joan. Joan was extremely fearful of suffering and depended upon Biggers to ease her anxiety and pain. Several months before her death, she deeded Greenacre to Biggers for $5,000. The fair market value of Greenacre at this time was $125,000. Joan was survived by two children and six grandchildren. Joan's children challenged the validity of the deed. Should the deed be declared invalid due to Biggers’s undue influence? Explain.