I grew up in Mexico, in a split household — American mother, Mexican father. Two languages, two passports, two sets of cultural mores. I grew up synthesizing, comparing, navigating, blending mischievously. Toggling between two worlds is what experts in bilingualism call it. My parents did what I haven't done adequately for my son — they forced me to speak the other language (in our case, English) at home to make us fully bilingual.