diff --git a/app/config/bootstrap.php b/app/config/bootstrap.php
index bba87c600..93e4c292f 100644
--- a/app/config/bootstrap.php
+++ b/app/config/bootstrap.php
@@ -250,7 +250,9 @@
 // \Cake\Utility\Inflector::rules('uninflected', ['dontinflectme']);
 
 \Cake\Utility\Inflector::rules('irregular', ['co_terms_and_condition' => 'co_terms_and_conditions']);
+\Cake\Utility\Inflector::rules('uninflected', ['co_terms_and_conditions' => 'co_terms_and_conditions']);
 \Cake\Utility\Inflector::rules('irregular', ['cou' => 'cous']);
+\Cake\Utility\Inflector::rules('uninflected', ['cous' => 'cous']);
 \Cake\Utility\Inflector::rules('irregular', ['meta' => 'meta']);
 
 /*
diff --git a/app/src/Lib/Traits/SearchFilterTrait.php b/app/src/Lib/Traits/SearchFilterTrait.php
index c1641cb45..b6ba84e60 100644
--- a/app/src/Lib/Traits/SearchFilterTrait.php
+++ b/app/src/Lib/Traits/SearchFilterTrait.php
@@ -85,7 +85,7 @@ public function addJoins(Query $query, string $attribute, ServerRequest $request
       return $query;
     }
 
-    $parentTable = $this->_alias;
+    $parentTable = $this->getAlias();
     $joinAssociations = [];
     // Iterate over the dot notation and add the joins in the correct order
     // People.Names
@@ -183,13 +183,25 @@ public function expressionsConstructor(Query $query, QueryExpression $exp, strin
     }
 
     // Prepend the Model name to the attribute
-    $modelPrefix = $this->_alias;
+    $modelPrefix = $this->getAlias();
     if(isset($this->searchFilters[$attribute]['model'])) {
       $associationNamesPath = explode('.', $this->searchFilters[$attribute]['model']);
       $modelPrefix = Inflector::pluralize(end($associationNamesPath));
     }
 
-    $attributeWithModelPrefix = $modelPrefix . '.' . $attribute;
+    /**
+     * Build a qualified attribute name. This is required for queries/associations that are beyond the
+     * first level. e.g. People.PersonRoles.Cous
+     * If the attribute matches the model's foreign-key pattern (eg, cou_id for Cous),
+     * return "<ModelPrefix>.id"; otherwise "<ModelPrefix>.<attribute>".
+     */
+    $expectedFk = StringUtilities::classNameToForeignKey($modelPrefix);
+    if (strcasecmp($attribute, $expectedFk) === 0) {
+      // Attribute is the FK to this model -> target the model's primary key
+      $attributeWithModelPrefix = $modelPrefix . '.id';
+    } else {
+      $attributeWithModelPrefix = $modelPrefix . '.' . $attribute;
+    }
 
     $search = $q;
 
diff --git a/app/src/Model/Table/PeopleTable.php b/app/src/Model/Table/PeopleTable.php
index af25f5a44..a0f386752 100644
--- a/app/src/Model/Table/PeopleTable.php
+++ b/app/src/Model/Table/PeopleTable.php
@@ -204,7 +204,11 @@ public function initialize(array $config): void {
       'types' => [
         'type' => 'type',
         'attribute' => 'Names.type'
-      ]
+      ],
+      'cous' => [
+        'type' => 'select',
+        'model' => 'Cous'
+      ],
     ]);
     
     // XXX expand/revise this as needed to work best with looking up the related models
@@ -244,7 +248,13 @@ public function initialize(array $config): void {
         'model' => 'People',
         'active' => false,
         'order' => 99
-      ]      
+      ],
+      'cou_id' => [
+        'type' => 'select',
+        'model' => 'PersonRoles.Cous',
+        'active' => true,
+        'order' => 7
+      ],
     ]);
 
     $this->setTabsConfig(
diff --git a/app/src/View/Helper/FilterHelper.php b/app/src/View/Helper/FilterHelper.php
index b6258bb14..74bda0c5c 100644
--- a/app/src/View/Helper/FilterHelper.php
+++ b/app/src/View/Helper/FilterHelper.php
@@ -33,6 +33,7 @@
 use Cake\Collection\Collection;
 use Cake\ORM\TableRegistry;
 use Cake\Utility\Hash;
+use Cake\Utility\Inflector;
 use Cake\View\Helper;
 
 class FilterHelper extends Helper
@@ -176,4 +177,37 @@ public function getFullName(int $personId): string
     $person = $ModelTable->primaryName($personId);
     return "{$person->given} {$person->family}";
   }
+
+  /**
+   * Normalize the filter button title for display.
+   * 1) Build initial title via humanize(underscore(label-source))
+   * 2) If the title is a sequence of capital letters separated by single spaces (e.g., "C O U"),
+   *    remove all spaces -> "COU"
+   * 3) If the title is CamelCase with no spaces (e.g., "ThisIsAName"),
+   *    insert a space before each capital and trim.
+   *
+   * @param string $rawLabel
+   * @return string
+   */
+  public function buildFilterButtonTitle(string $rawLabel): string
+  {
+    // Humanize
+    $filterTitle = Inflector::humanize(
+      Inflector::underscore($rawLabel)
+    );
+
+    // If like "C O U" (series of capital letters separated by spaces), collapse spaces -> "COU"
+    if (preg_match('/^[A-Z](?:\s[A-Z])+$/', $filterTitle) === 1) {
+      return str_replace(' ', '', $filterTitle);
+    }
+
+    // If CamelCase with no spaces, insert spaces before capitals and trim
+    if (!str_contains($filterTitle, ' ') && preg_match('/[A-Z]/', $filterTitle) === 1) {
+      // Insert a space before every capital letter except the first character
+      $filterTitle = preg_replace('/(?<!^)(?=[A-Z])/', ' ', $filterTitle);
+      return trim((string)$filterTitle);
+    }
+
+    return $filterTitle;
+  }
 }
\ No newline at end of file
diff --git a/app/templates/element/filter/topButtons.php b/app/templates/element/filter/topButtons.php
index 91ecbdeb0..d89e9199f 100644
--- a/app/templates/element/filter/topButtons.php
+++ b/app/templates/element/filter/topButtons.php
@@ -65,12 +65,9 @@
   }
 }
 
-$filter_title =
-  Inflector::humanize(
-    Inflector::underscore(
-      $vv_searchable_attributes[$key]['label'] ?? $columns[$key]['label']
-    )
-  );
+$filter_title = $this->Filter->buildFilterButtonTitle(
+        $vv_searchable_attributes[$key]['label'] ?? $columns[$key]['label']
+);
 
 ?>