diff --git a/doc/design-space-repositories.md b/doc/design-space-repositories.md
index 06e80e1..f1d5313 100644
--- a/doc/design-space-repositories.md
+++ b/doc/design-space-repositories.md
@@ -53,6 +53,8 @@ Two things in one repo:
    - `<https://w3id.org/fair/3pff/participatedAsImplementerAspirantIn>`
    - `<https://w3id.org/fair/3pff/participatedAsParticipantIn>`
    - `<https://w3id.org/kpxl/gen/terms/hasAdmin>`
+   - `<https://w3id.org/kpxl/gen/terms/hasGuest>`
+   - `<https://w3id.org/kpxl/gen/terms/hasHost>`
    - `<https://w3id.org/kpxl/gen/terms/hasObserver>`
    - `<https://w3id.org/kpxl/gen/terms/hasProjectLead>`
    - `<https://w3id.org/kpxl/gen/terms/hasTeamMember>`
diff --git a/src/main/java/com/knowledgepixels/query/vocabulary/BackcompatRolePredicates.java b/src/main/java/com/knowledgepixels/query/vocabulary/BackcompatRolePredicates.java
index fdcf93a..182a5c3 100644
--- a/src/main/java/com/knowledgepixels/query/vocabulary/BackcompatRolePredicates.java
+++ b/src/main/java/com/knowledgepixels/query/vocabulary/BackcompatRolePredicates.java
@@ -62,6 +62,8 @@ private static IRI iri(String s) {
             Map.entry(iri("https://w3id.org/fair/3pff/participatedAsTrainerIn"),              Direction.REGULAR),
             // KPXL gen terms
             Map.entry(iri("https://w3id.org/kpxl/gen/terms/hasAdmin"),       Direction.INVERSE),
+            Map.entry(iri("https://w3id.org/kpxl/gen/terms/hasGuest"),       Direction.INVERSE),
+            Map.entry(iri("https://w3id.org/kpxl/gen/terms/hasHost"),        Direction.INVERSE),
             Map.entry(iri("https://w3id.org/kpxl/gen/terms/hasObserver"),    Direction.INVERSE),
             Map.entry(iri("https://w3id.org/kpxl/gen/terms/hasProjectLead"), Direction.INVERSE),
             Map.entry(iri("https://w3id.org/kpxl/gen/terms/hasTeamMember"),  Direction.INVERSE),
diff --git a/src/test/java/com/knowledgepixels/query/SpacesExtractorTest.java b/src/test/java/com/knowledgepixels/query/SpacesExtractorTest.java
index b23b7fc..a1cdc90 100644
--- a/src/test/java/com/knowledgepixels/query/SpacesExtractorTest.java
+++ b/src/test/java/com/knowledgepixels/query/SpacesExtractorTest.java
@@ -347,6 +347,30 @@ void extract_backcompatInverseDirection_emitsRoleInstantiation() throws Exceptio
         assertDoesNotContain(out, subject, REGULAR_PROPERTY, hasTeamMember);
     }
 
+    @Test
+    void extract_backcompatHasGuestAndHost_emitsRoleInstantiation_issue114() throws Exception {
+        // gen:hasGuest / gen:hasHost are space-centric (INVERSE), like hasObserver/hasAdmin.
+        // They were missing from BackcompatRolePredicates, so the extractor dropped
+        // guest/host member RIs entirely (issue #114).
+        for (String pred : new String[] {
+                "https://w3id.org/kpxl/gen/terms/hasGuest",
+                "https://w3id.org/kpxl/gen/terms/hasHost" }) {
+            IRI predicate = vf.createIRI(pred);
+            // Single-triple assertion → auto-typed by the predicate via NanopubUtils.getTypes.
+            Nanopub np = creator()
+                    .assertion(SPACE_IRI_1, predicate, MEMBER_AGENT)
+                    .finalizeNanopub();
+
+            List<Statement> out = SpacesExtractor.extract(np, defaultContext());
+            IRI subject = forRoleInstantiation(ARTIFACT_CODE);
+
+            assertContains(out, subject, RDF.TYPE, GEN.ROLE_INSTANTIATION);
+            assertContains(out, subject, FOR_SPACE, SPACE_IRI_1);
+            assertContains(out, subject, INVERSE_PROPERTY, predicate);
+            assertContains(out, subject, FOR_AGENT, MEMBER_AGENT);
+        }
+    }
+
     @Test
     void extract_backcompatRegularDirection_swapsSpaceAndAgent() throws Exception {
         // Agent-centric source: <agent> <predicate> <space>. REGULAR under the publisher