As technology rapidly evolves, voice-command-based smart assistants are becoming integral to our daily lives. However, this advancement overlooks the needs of the Deaf and Hard of Hearing (DHH) community, creating a technological gap in current systems. To address this technological oversight, this study develops a Mixed-Reality (MR) application that integrates Augmented Reality (AR), Artificial Intelligence (AI), and the Internet of Things (IoT) technologies to fill the gaps in safety, communication, and accessibility for DHH individuals at home. By employing the User-Centric design methodology, this study begins with a needs assessment through a literature review and online survey to understand the unique challenges and preferences of the DHH community. The key contribution of this study lies in its innovative integration of technologies within a Mixed-Reality (MR) framework, with the goal of creating a more inclusive and accessible home environment for the DHH community.