Pedro Fernández Sánchez de Aranda its not a king son

Pedro Fernández Sánchez de Aranda, El Viejo

Family
Sancho married Maria de Molina in 1282, but at first their marriage did not have the necessary papal dispensation for two reasons: First, they had a distant blood relation, and second, Sancho had been betrothed as an infant to a rich Catalan heiress named Guillerma Moncada.

They had the following children:

Isabella (1283–1328). Married first James II of Aragon and secondly John III, Duke of Brittany.
Ferdinand IV (1285–1312).
Alfonso (1286–1291)
Henry (1288–1299)
Peter (1290–1319) married Maria daughter of James II of Aragon
Philip (1292–1327). Married his cousin Margarita de la Cerda, daughter of Alfonso de la Cerda (1270-1333).[1]
Beatrice (1293–1359). Married Afonso IV of Portugal.
He had three illegitimate children:

By María Alfonso Téllez de Menezes (d. Toro), wife of Juan García, Lord of Ucero:

Violante Sánchez (died bef. 1327), who held the dowry of Ucero as its lady, married in 1293 Fernando Rodríguez de Castro, Lord of Lemos.[2]
Teresa Sánchez, who married Juan Alfonso Téllez de Meneses (died 5 May 1304), a Castilian nobleman, 4th Lord of Alburquerque, who became the 1st Count of Barcelos and was the Mordomo Mor (high steward) of King Denis I of Portugal, and had female issue. After the death of her first husband, she married Ruy Gil de Villalobos, with whom she had one daughter.
by another woman whose name is unknown, he had:

Alfonso Sánchez, who married, as his second wife, María Díaz de Salcedo, but died without issue.