Not only can they listen in. You have a contractual requirement to tell everyone in range of an appliance that they may be eavesdropped upon.
CONSENT REQUIREMENT: You acknowledge and agree that it is your sole responsibility to obtain all necessary consents from any third parties whose voices may be captured by the Product and to notify household members and guests that their voices may be captured and processed, in compliance with applicable wiretapping, eavesdropping, and privacy laws. If anyone does not consent, you should disable the microphone or voice features in the settings. LGE disclaims any liability for your failure to obtain such consent or provide such notification.