How to keep Amazon's Alexa from becoming a parenting nightmare

Amazon's Echo has been the hot tech gadget to own since it first launched more than two years ago. The home speaker pairs with a digital assistant, Alexa, allowing users to play music, search recipes or check the weather through simple voice commands. As a parent, the Echo can be your best friend. It tracks to-do-lists, what you need at the grocery store, and can even help with homework. For example, one six-year-old in Texas was chatting with Alexa, and ended up buying four pounds of cookies and a dollhouse worth $170.