The Family History Twin provides a complete framework for preserving your genealogy research in a structured, enduring, AI-assisted format. Designed for genealogists, historians, and family archivists, this book demonstrates how to build an evidence-based AI Twin capable of organizing documents, interpreting DNA results, generating narrative histories, and maintaining continuity across generations. Readers will learn how to configure neutral and ethical AI settings, upload and structure archival materials, create accurate ancestor stories, implement privacy and consent boundaries, and establish long-term stewardship for their digital legacy. With clear checklists, workflows, and preservation strategies, this book helps ensure that family history is not only saved but understood and accessible to descendants.