The eldest of the twin sisters Pili and Mili, orphaned and separated throughout her life, is the heiress of her grandfather's Diogenes fortune. However, only his widow Grandmother Rosa, who lives on the Costa del Sol, knows with certainty which of them is the oldest. Therefore, it is up to you to decide who will take the fortune. In order to clarify the matter, both they and the relatives of Diogenes who have been taking care of them are going to see Grandma .