idaho

Сделал так:

public function getSiblings(){
            $sire = Pedigrees::find()->where(['LIKE', 'sire', $this->sire])->all();
            $dam = Pedigrees::find()->where(['LIKE', 'dam', $this->dam])->all();
             $sibling = Pedigrees::find()
            ->where(['sire' => $sire, 'dam' => $dam])
            ->all();
        return $sibling;

Спасибо, но нет хотя бы куска кода для решения вопроса.

в таком варианте выходит ошибка Getting unknown property: app\controllers\PedigreesController::partner

public function actionView($id)
    {
       $query = "SELECT dam as partner_id FROM pedigrees WHERE (sire=$id and dam<>0) group by dam union SELECT sire as partner_id FROM pedigrees WHERE (dam=$id and sire<>0) group by sire order by (select a.name from pedigrees a where pedigrees_id=partner_id)";
       $partner = Pedigrees::findBySql($query)->all();
           return $this->render('view', [
            'model' => $this->findModel($id),
            'partner' => $this->partner,
        ]);
    }

вывод:

<?php foreach ($partners as $name) {
    echo $name->name . '<br>';
}?>