You don't say what languages you two have as mother tongues; have you French or Portuguese; but children aren't impeded by being bilingual from exposure to and immersion in two languages or more.My daughter was at international school from 4.Her best friend in class started with no English but was trilingual by 5, because her parents had different mother tongues;French, which both parents used, and her mother's Danish. There were similar stories elsewhere in the school and, of course, bilingual was normal.
Children taught in this way know to think in all their languages and have no difficulty seeing them as separate; I have witnessed a nine year old, in a restaurant, conducting conversations in three languages at once, changing only for whoever spoke last, and all without missing a beat. The adults were switching languages too.
Adults who learn may never acquire this facility.