Is Siri spying on me? My iPad has shifted to Spanish ads after conversations in my home

I watch most TV shows and movies on my iPad these days, and something strange happened recently. My iPad – or rather apps such as Hulu and Bravo linked via Apple TV on my iPad – started showing me commercials in Spanish. That was interesting, since I hadn't touched the language settings, watched any shows in Spanish, or done any kind of internet activity in another language. But even more curious, was what had changed when the new commercials popped up. We had just moved to a more Spanish-speaking area of Oakland, California.