His parents were both Castillian, his mother was from Soria, & his father was from Valladolid.
He also had remote Galician ancestry.
Many people on the anthroforums see non-existent Amerindian traits in Caucasoid Mexicans, even if both of their parents immigrated from Europe, people see Amerindian in Whites simply because they were born in Mexico, or in Latin America, if he was born in the USA, you wouldn't be seeing the Amerindian, especially if he had a non-Spanish name.