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According to a live video chat hosted by Marco Diaz and the book Star and Marco's Guide to Mastering Every Dimension, Rafael Diaz moved from Jalisco, Mexico, to Cleveland, Ohio, and met his future wife Angelica "Angie" Phalange in a cafe while attending high school. They later got married, moved to Echo Creek, California, and had a son named Marco.
Over the following years, the Diaz family would serve as host family to a number of foreign exchange students, including Gustav and Star Butterfly.
In "Marco Jr.", Angie is revealed to be pregnant with her and Rafael's second son, who they have named Marco Jr.
- Daniella (Belgium)
- Pippo (Italy)
- Akil (Egypt)
- Klaus (Switzerland)
- Gustav (Scandinavia)
- Star Butterfly (Mewni)
- In the Diaz Household, pictures of a llama and a robot can be seen on their wall of former exchange students, as seen in "The Other Exchange Student".