Erin Bulcao on Instagram: "One parent one language or OPOL, has been our method with all of the girls. Primarily because we don’t have another option. Nick doesn’t know Spanish and if we want them to learn the language it has to come from me. This is exactly how I was raised, but in reverse. When we lived in Mexico City, my mom didn’t know a lick of Spanish. So I spoke English with her and Spanish with everyone else. She would take me to the market and use me to help translate for her! I went to