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- Add PersonService.setFamilyMember (write, @Transactional) and findAllFamilyMembers; PersonRepository gains the findByFamilyMemberTrueOrderBy projection. - RelationshipService orchestrates PersonService + the inference service; never reaches into PersonRepository directly. addRelationship guards self-relationship, year range, circular PARENT_OF (Nora B2), and DataIntegrityViolation→DUPLICATE_RELATIONSHIP. deleteRelationship enforces ownership from either side (Nora B1). - Extend RelationshipDTO with personDisplayName + birth/death year so the frontend can render rows from either viewpoint. - 8 unit tests, written against a stub (red), then green: FORBIDDEN delete, CIRCULAR add, DUPLICATE add, self-relationship, year range, happy-path persistence, ownership-from-object, RELATIONSHIP_NOT_FOUND. Full backend suite: 1399/1399 green. Refs #358. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>