A joke that a pupil played on the twins teacher, Mrs. Papilla, ends up with the twins being unfairly punished. By chance, their aunt Elvira is going to pick them up from school that day and the punishment leads to her and the headmaster meeting and falling in love. Some time afterwards, at Christmas, during dinner on New Years Eve, Elviras fiancé is introduced to Norma and Marcos family as their future uncle. The wedding will be in spring. The twins give them their present at the wedding: a lottery ticket with the number 5, which is the number that has had to do with so many other recent events in their lives. In fact, all the numbers on the ticket are 5s. During the wedding, filled with humorous details, a great discovery is made: the number chosen by the twin has won the grand prize. Their aunt decides to give them what every they want and they ask for a trip to Scotland, where they were born and where they really want to visit.