diff --git a/blockbase/functions.php b/blockbase/functions.php
index f4fb72de2e..1345846a68 100644
--- a/blockbase/functions.php
+++ b/blockbase/functions.php
@@ -103,6 +103,7 @@ function blockbase_scripts() {
 }
 
 require get_template_directory() . '/inc/fonts/custom-fonts.php';
+require get_template_directory() . '/inc/rest-api.php';
 
 
 // Force menus to reload
diff --git a/blockbase/inc/rest-api.php b/blockbase/inc/rest-api.php
new file mode 100644
index 0000000000..271834d2ee
--- /dev/null
+++ b/blockbase/inc/rest-api.php
@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * Removes the style variations of Blockbase child themes inherited by the parent theme.
+ *
+ * @param WP_REST_Response|WP_HTTP_Response|WP_Error|mixed $response Result to send to the client.
+ * @param array $handler Route handler used for the request.
+ *
+ * @return WP_REST_Response|WP_HTTP_Response|WP_Error|mixed Result to send to the client.
+ */
+function blockbase_remove_style_variations_from_child_themes( $response, $handler ) {
+	if ( ! isset( $handler['callback'] ) || ! is_array( $handler['callback'] ) ) {
+		return $response;
+	}
+
+	$handler_class  = isset( $handler['callback'][0] ) ? $handler['callback'][0] : null;
+	$handler_method = isset( $handler['callback'][1] ) ? $handler['callback'][1] : null;
+	$opt_out        = wp_get_global_settings( array( 'custom', 'optOutOfParentStyleVariations' ) );
+
+	/*
+	 * Prevents Blockbase child themes from being considered child themes in the
+	 * `wp/v2/global-styles/themes/:theme/variations` API endpoint, so they don't
+	 * inherit the style variations from the parent theme.
+	 */
+	if ( $opt_out && is_a( $handler_class, 'WP_REST_Global_Styles_Controller' ) && 'get_theme_items' === $handler_method ) {
+		add_filter( 'template_directory', 'get_stylesheet_directory' );
+	}
+
+	return $response;
+}
+
+add_filter( 'rest_request_before_callbacks', 'blockbase_remove_style_variations_from_child_themes', 10, 2 );
diff --git a/blockbase/theme.json b/blockbase/theme.json
index 5010804c7b..7ed7679a82 100644
--- a/blockbase/theme.json
+++ b/blockbase/theme.json
@@ -93,6 +93,7 @@
 			]
 		},
 		"custom": {
+			"optOutOfParentStyleVariations": false,
 			"alignment": {
 				"alignedMaxWidth": "50%"
 			},
diff --git a/jackson/theme.json b/jackson/theme.json
index 3ab5747adc..9ba6480cc0 100644
--- a/jackson/theme.json
+++ b/jackson/theme.json
@@ -24,7 +24,8 @@
 				"primary": "var(--wp--preset--color--foreground)",
 				"secondary": "var(--wp--preset--color--foreground)",
 				"tertiary": "var(--wp--preset--color--background)"
-			}
+			},
+            "optOutOfParentStyleVariations": true
         }
     },
     "styles": {
diff --git a/kingsley/theme.json b/kingsley/theme.json
index 5e2181bf6c..68b67f5bd0 100644
--- a/kingsley/theme.json
+++ b/kingsley/theme.json
@@ -24,7 +24,8 @@
 				"primary": "var(--wp--preset--color--foreground)",
 				"secondary": "var(--wp--preset--color--foreground)",
 				"tertiary": "var(--wp--preset--color--background)"
-			}
+			},
+            "optOutOfParentStyleVariations": true
         }
     },
     "styles": {