Information: - John of Portugal ( Portuguese pronunciation : ( uw ) ; Portuguese : Joao ) ( 1349 -- 1397 ) was the son of the Portuguese King Peter I and a Galician noblewoman named Ines de Castro who had arrived in Portugal as a maid of Infanta Constance of Castile , recently married to Pedro I ( royal heir at the time ) . - Ines de Castro (Ines de Castro in Castilian; 1325 7 January 1355) was a Galician noblewoman born of a Portuguese mother. She is best known as lover and posthumously-recognized wife of King Peter I of Portugal. The dramatic circumstances of her relationship with Peter I, which was forbidden by his father King Afonso IV, her murder at the orders of Afonso, Peter's bloody revenge on her killers, and the legend of the coronation of her exhumed corpse by Peter, have made Ines de Castro a frequent subject of art, music, and drama through the ages. - Peter I (Portuguese: "Pedro I" (8 April 1320 18 January 1367), called the Just or the Cruel) (Portuguese: "o Justo", "O Cruel"), was King of Portugal and of the Algarves from 1357 until his death. He was the third but only surviving son of Afonso IV of Portugal and his wife, Infanta Beatrice of Castile. What is the relationship between 'john' and 'peter i of portugal'?
A:
father