Can someone tell me a sum up of the book "La Celestina"??

Calisto, a young nobleman enters the garden of Pleberio in pursuit of his falcon.  There he sees Pleberio’s daughter, Melibea, and falls madly in love with her, but she quickly rejects his hasty advances. On the advice of a corrupt servant, Sempronio, Calisto seeks the help of Celestina, a former prostitute, and now an active go-between, witch, and virgin-mender.

Another of Calisto’s servants, Pármeno, warns his master of the dangers of associating with Celestina, but Calisto brushes his objections aside.  Irritated by Calisto’s ingratitude and resentful of Sempronio’s favoured status, Pármeno is susceptible to Celestina’s guiles, especially when she dangles before him the prospects of sexual favours with a protegee of hers, Areúsa.

After invoking the devil, Celestina sets to work quickly on Calisto’s behalf.  As seller of cosmetics and trinkets, she has easy access to well-to-do houses, and on this pretext she visits Melibea and her mother, Alisa. By chance, Alisa is called away, leaving Melibea alone with Celestina.  

By clever insinuations and subtle psychology, Celestina soon piques Melibea’s curiosity about a toothache that Calisto is suffering from.  She extracts from Melibea a waistband, and the promise of a letter, to help Calisto overcome his sickness!

Explanation:

is it a book about love affair that ends in tradgety?

rodrigo es el padre de juan.

ana es la abuela de aldana.

roberto es el hermano de carla.

marisol es la madre de pedro.

andrea es la prima de carla.

well, if he says unos it is 1, if he says dos, it is 2, if he says tres, it is 3, if he says cuatro, it is 4