How many languages do you speak ?

I only speak English, everyone in my house speaks English as well. But when I was in elementary school my best friend down the street was Korean and every time I would go to her house, her family would all speak in Korean to each other and it was weird for me because I just kinda sat there listening but not understanding what was going on. In class we learned that everyone has different values. For example, when I would go to her house, her parents were never home and her grandma lived with them to take care of the kids while her parents were at work. A lot of cultures live like that; with a lot of their family all living together in one home, speaking different languages.