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I'm sorry for the confusion,

As you may have noticed in Section 7. of this article, you can control a Fire TV Cube from another device such as an Echo Show or an Echo Dot.

If you want to do this remotely, from your house, you will need to have an Echo Show or an Echo Dot logged into your mother in law's Amazon account. It works fine even though you are are a different Wi-Fi connection. I have done this to help my Aunt who lives 2500 miles away.

If this is something that you need to routinely do, I suggest keeping Echo Dot logged into her account.

You can mute the microphone or change the wake word so that it doesn't pick up your normal Alexa household commands

Frank