I wonder what English has to do with a family's income.

Rafa's family has been doing business with people who speak Spanish.
Wikipedia (excerpts): "Spanish is
a global language with about
500 million native speakers, mainly in the Americas and Spain, and about
600 million when including second language speakers. Spanish is the official language of
20 countries, as well as one of the six
official languages of the United Nations. Spanish is the world's second-most spoken native language after Mandarin Chinese. It is an
official language of countries on four continents and is used as an
official language by many international organizations, including the United Nations, European Union, Organization of American States, Union of South American Nations, Community of Latin American and Caribbean States, African Union, among others."