I've already been told of one problem with a grandkid who overrides his dad's commands. In another daughter's house, the 9yr-old routinely tries to gain command. Currently, you can't set it to recognize specific voices, so anyone has control.
Also, I have one granddaughter named 'Alexis' and Echo picks up on it as Alexa. But you can now choose among 3 names; Alexa, Amazon, or Echo.