The Historia Roderici names “Nuño Laínez” as the son of “Laín Fernández”. The "Corónicas" Navarras does not directly name the father of "Nuyno Laniz", but the context of the narrative as a whole implies that he was the son of Laín Fernández. The Nobiliario of Pedro Conde de Barcelos names "Nuño Lainez" as the son of "Lain Fernandez". 1
Marriage Information:
Nuño married doña Eilo Fernández DE CASTILLA, daughter of don Fernando Rodrígez DE CASTILLA.
Sources
1 Foundation for Medieval Genealogy, Medlands: Nuño Laínez.