Because her eldest son Juan had been pestering her for capital to start a business, Josefa gave him P100,000. Five years later, Josefa died, leaving a last will and testament in which she instituted only her four younger children as her sole heirs. At the time of her death, her only properly left was P900,000.00 in a bank. Juan opposed the will on the ground of preterition. How should Josefa's estate be divided among her heirs? State briefly the reason(s) for your answer. (2001 BAR)