diff --git a/includes/Registry.php b/includes/Registry.php
index f12807a..93d28e8 100644
--- a/includes/Registry.php
+++ b/includes/Registry.php
@@ -35,7 +35,7 @@ public function get_relationship_key( $from, $to, $name ) {
 		sort( $to );
 		$to = implode( '.', $to );
 
-		return "{$from}_{$to}_{$name}";
+		return "{$from}~{$to}~{$name}";
 	}
 
 	/**
@@ -70,6 +70,20 @@ public function get_post_to_post_relationship_by_key( $key ) {
 			return $this->post_post_relationships[ $key ];
 		}
 
+		// Fuzzy match the relationship by parsing the key and looping through the relationships
+		foreach ( $this->post_post_relationships as $relationship_key => $relationship ) {
+			$relationship_key_parts = explode( '~', $relationship_key );
+			$key_parts = explode( '~', $key );
+
+			if (
+				$key_parts[0] === $relationship_key_parts[0] &&
+				strpos( $relationship_key_parts[1], $key_parts[1] ) !== false &&
+				$key_parts[2] === $relationship_key_parts[2]
+			) {
+				return $this->post_post_relationships[ $relationship_key ];
+			}
+		}
+
 		return false;
 	}
 
@@ -91,10 +105,6 @@ public function get_post_to_post_relationship( $cpt1, $cpt2, $name ) {
 			return $relationship;
 		}
 
-		// Try the inverse, only if "cpt2" isn't an array
-		if ( is_array( $cpt2 ) ) {
-			return false;
-		}
 		$key = $this->get_relationship_key( $cpt2, $cpt1, $name );
 
 		$relationship = $this->get_post_to_post_relationship_by_key( $key );
diff --git a/includes/Relationships/PostToPost.php b/includes/Relationships/PostToPost.php
index ce53e29..4d51b9f 100644
--- a/includes/Relationships/PostToPost.php
+++ b/includes/Relationships/PostToPost.php
@@ -61,13 +61,9 @@ public function setup() {
 
 		// Make sure CPT is not the same as "from" so we don't get a duplicate, then register if enabled
 		if ( $this->to !== $this->from && $this->enable_to_ui === true ) {
-			// Currently, only support a default UI when the "to" end is a single post type
-			if ( count( $this->to ) === 1 ) {
-				$this->to_ui = new \TenUp\ContentConnect\UI\PostToPost( $this, $this->to[0], $this->to_labels, $this->to_sortable );
-				$this->to_ui->setup();
-			}
+			$this->to_ui = new \TenUp\ContentConnect\UI\PostToPost( $this, $this->to, $this->to_labels, $this->to_sortable );
+			$this->to_ui->setup();
 		}
-
 	}
 
 	/**
diff --git a/includes/UI/MetaBox.php b/includes/UI/MetaBox.php
index cad50c1..24ff162 100644
--- a/includes/UI/MetaBox.php
+++ b/includes/UI/MetaBox.php
@@ -72,7 +72,7 @@ public function save_post( $post_id ) {
 			$post_type = get_post_type( $post_id );
 			if ( $relationship->from_ui->render_post_type === $post_type ) {
 				$relationship->from_ui->handle_save( $relationship_data, $post_id );
-			} else if ( is_object( $relationship->to_ui ) && $relationship->to_ui->render_post_type === $post_type ) {
+			} else if ( is_object( $relationship->to_ui ) && in_array( $post_type, $relationship->to_ui->render_post_type, true ) ) {
 				$relationship->to_ui->handle_save( $relationship_data, $post_id );
 			}
 
diff --git a/includes/UI/PostToPost.php b/includes/UI/PostToPost.php
index 67bd134..ea5b38a 100644
--- a/includes/UI/PostToPost.php
+++ b/includes/UI/PostToPost.php
@@ -11,13 +11,22 @@ public function setup() {
 	}
 
 	public function filter_data( $data, $post ) {
+
+		if ( ! is_array( $this->render_post_type ) ) {
+			$this->render_post_type = array( $this->render_post_type );
+		}
+
 		// Don't add any data if we aren't on the post type we're supposed to render for
-		if ( $post->post_type !== $this->render_post_type ) {
+		if ( ! in_array( $post->post_type, $this->render_post_type ) ) {
 			return $data;
 		}
 
 		// Determine the other post type in the relationship
-		$other_post_type = $this->relationship->from == $this->render_post_type ? $this->relationship->to : $this->relationship->from;
+		if ( $post->post_type === $this->relationship->from ) {
+			$other_post_type = $this->relationship->to;
+		} else {
+			$other_post_type = $this->relationship->from;
+		}
 
 		$final_posts = array();