The answer is: you don't. I personally refuse to have something like the Echo in my house.
Yes, this is my answer too. No chance on the face of the Earth that an Amazon(R) or Google(R) Corporate Surveillance Device is coming into my home.
What will you do when the people who have personal assistants have a huge advantage over you and your kids? E.g. like being afraid of using a computer in 2016?
I'm not criticising you, I'm looking for honest discussion. We can opt out of these things, until they become de-facto mandatory to education, jobs, etc.