This is not the experience we want you to have, let me help you. A few questions: which Nest speakers are we working with? When did your issue begin? Were there any recent changes made? Are you all on the same Wi-Fi network? Do they have access to your account? Have you added them as a home member or is it the other way around?
It would help a lot if you could do a sequential reboot first:
Keep us posted.
Thanks for helping, Cathal_S.