She grew up fluent in both Spanish and English, but I often observed her using code switching with her parents and siblings. Another example is his younger sister, she understands both Spanish and English but never speaks Spanish. Interestingly, when her father speaks to her in Spanish, she understands him perfectly and responds in English. It's very fun to hear them talk to each other in their own way, using both languages. It would be interesting to see my friend's family learn the concept of code switching because they use it naturally without it