diff --git a/src/store/article/addChild.js b/src/store/article/addChild.js
index 9f463f4..f625e0e 100644
--- a/src/store/article/addChild.js
+++ b/src/store/article/addChild.js
@@ -147,6 +147,21 @@ export default function addChild(provider) {
       });
       const childId = childRes.rows[0]?.id ?? childRes.insertId;
 
+      // Copy existing attribute values from father (ancestor attributes that father has)
+      const fatherAttrsRes = await runner.query(
+        'SELECT attributevalue_id, sort FROM articleattributevalue WHERE article_id = @fatherId',
+        { fatherId },
+      );
+      for (const faRow of fatherAttrsRes.rows) {
+        if (faRow.attributevalue_id !== finalValueId) {
+          await runner.query(articleAttrValQueries.INSERT_ROW, {
+            articleId: childId,
+            attributeValueId: faRow.attributevalue_id,
+            sort: faRow.sort,
+          });
+        }
+      }
+
       // Link articleattributevalue
       await runner.query(articleAttrValQueries.INSERT_ROW, {
         articleId: childId,
diff --git a/src/store/article/toggleFather.js b/src/store/article/toggleFather.js
index c4da910..d467311 100644
--- a/src/store/article/toggleFather.js
+++ b/src/store/article/toggleFather.js
@@ -41,13 +41,27 @@ export default function toggleFather(provider) {
           throw new Error('attributeNameId is required to become a father article');
         }
 
-        // Verify article is not a child of another article
         const currentRes = await runner.query(
           'SELECT fatherarticle_id FROM article WHERE id = @articleId',
           { articleId },
         );
-        if (currentRes.rows[0]?.fatherarticle_id != null) {
-          throw new Error('A child article cannot become a father');
+
+        // If article is a child, verify attribute is not used by father or any father up the chain
+        let currentFatherId = currentRes.rows[0]?.fatherarticle_id;
+        const visited = new Set();
+        while (currentFatherId != null && !visited.has(currentFatherId)) {
+          visited.add(currentFatherId);
+          const fRes = await runner.query(
+            'SELECT a.fatherarticle_id, a.fatherattributename_id, an.name AS fatherAttributeName FROM article a LEFT JOIN attributename an ON an.id = a.fatherattributename_id WHERE a.id = @currentFatherId',
+            { currentFatherId },
+          );
+          const fRow = fRes.rows[0];
+          if (!fRow) break;
+          if (fRow.fatherattributename_id != null && Number(fRow.fatherattributename_id) === Number(targetAttrId)) {
+            const attrName = fRow.fatherAttributeName || 'ancestor';
+            throw new Error(`Attribute "${attrName}" is already used by an ancestor father article`);
+          }
+          currentFatherId = fRow.fatherarticle_id;
         }
 
         // Verify attribute exists and belongs to company
@@ -59,6 +73,17 @@ export default function toggleFather(provider) {
           throw new Error('Attribute name not found');
         }
 
+        // Verify article does not have an attribute value for this attribute
+        const existingValRes = await runner.query(
+          `SELECT aav.id FROM articleattributevalue aav
+           INNER JOIN attributevalue av ON av.id = aav.attributevalue_id
+           WHERE aav.article_id = @articleId AND av.attribute_id = @attributeId`,
+          { articleId, attributeId: Number(targetAttrId) },
+        );
+        if (existingValRes.rows.length > 0) {
+          throw new Error('A father article cannot have attribute values for its variant attribute');
+        }
+
         await runner.query(queries.TOGGLE_FATHER, {
           articleId,
           isFather: 1,
diff --git a/src/store/articleattributevalue/setByArticleSku.js b/src/store/articleattributevalue/setByArticleSku.js
index db35987..9ab535f 100644
--- a/src/store/articleattributevalue/setByArticleSku.js
+++ b/src/store/articleattributevalue/setByArticleSku.js
@@ -79,6 +79,42 @@ export default function setByArticleSku(provider) {
         });
       }
 
+      // Check father / child constraints
+      const artRes = await runner.query(
+        'SELECT id, is_father, fatherarticle_id, fatherattributename_id FROM article WHERE id = @articleId',
+        { articleId },
+      );
+      const article = artRes.rows[0];
+
+      if (article?.is_father && article.fatherattributename_id) {
+        const hasFatherAttr = validated.some((v) => v.attributeId === article.fatherattributename_id);
+        if (hasFatherAttr) {
+          throw new Error('A father article cannot have attribute values for its variant attribute');
+        }
+      }
+
+      if (article?.fatherarticle_id != null) {
+        let currentFatherId = article.fatherarticle_id;
+        const visited = new Set();
+        while (currentFatherId != null && !visited.has(currentFatherId)) {
+          visited.add(currentFatherId);
+          const fatherRes = await runner.query(
+            'SELECT a.fatherarticle_id, a.fatherattributename_id, an.name AS fatherAttributeName FROM article a LEFT JOIN attributename an ON an.id = a.fatherattributename_id WHERE a.id = @currentFatherId',
+            { currentFatherId },
+          );
+          const fRow = fatherRes.rows[0];
+          if (!fRow) break;
+          if (fRow.fatherattributename_id != null) {
+            const hasFatherAttr = validated.some((v) => v.attributeId === fRow.fatherattributename_id);
+            if (!hasFatherAttr) {
+              const fatherAttrName = fRow.fatherAttributeName || 'ancestor variant attribute';
+              throw new Error(`Child article must have an attribute value for the father attribute "${fatherAttrName}"`);
+            }
+          }
+          currentFatherId = fRow.fatherarticle_id;
+        }
+      }
+
       await runner.query(deleteSql, { articleId });
 
       const inserted = [];