diff --git a/packages/FamilyTree/Reflection/FamilyRelationsAnalyzer.php b/packages/FamilyTree/Reflection/FamilyRelationsAnalyzer.php
index 1732d805bfd..099c534f4e7 100644
--- a/packages/FamilyTree/Reflection/FamilyRelationsAnalyzer.php
+++ b/packages/FamilyTree/Reflection/FamilyRelationsAnalyzer.php
@@ -9,7 +9,6 @@
 use PhpParser\Node\Stmt\Interface_;
 use PHPStan\Reflection\ClassReflection;
 use PHPStan\Reflection\ReflectionProvider;
-use Rector\Core\PhpParser\AstResolver;
 use Rector\Core\Util\Reflection\PrivatesAccessor;
 use Rector\NodeNameResolver\NodeNameResolver;
 
@@ -19,7 +18,6 @@ public function __construct(
         private readonly ReflectionProvider $reflectionProvider,
         private readonly PrivatesAccessor $privatesAccessor,
         private readonly NodeNameResolver $nodeNameResolver,
-        private readonly AstResolver $astResolver,
     ) {
     }
 
@@ -58,25 +56,29 @@ public function getClassLikeAncestorNames(Class_ | Interface_ | Name $classOrNam
 
         if ($classOrName instanceof Name) {
             $fullName = $this->nodeNameResolver->getName($classOrName);
-            $classLike = $this->astResolver->resolveClassFromName($fullName);
-        } else {
-            $classLike = $classOrName;
+            $classReflection = $this->reflectionProvider->getClass($fullName);
+            $ancestors = array_merge($classReflection->getParents(), $classReflection->getInterfaces());
+
+            return array_map(
+                static fn (ClassReflection $classReflection): string => $classReflection->getName(),
+                $ancestors
+            );
         }
 
-        if ($classLike instanceof Interface_) {
-            foreach ($classLike->extends as $extendInterfaceName) {
+        if ($classOrName instanceof Interface_) {
+            foreach ($classOrName->extends as $extendInterfaceName) {
                 $ancestorNames[] = $this->nodeNameResolver->getName($extendInterfaceName);
                 $ancestorNames = array_merge($ancestorNames, $this->getClassLikeAncestorNames($extendInterfaceName));
             }
         }
 
-        if ($classLike instanceof Class_) {
-            if ($classLike->extends instanceof Name) {
-                $ancestorNames[] = $this->nodeNameResolver->getName($classLike->extends);
-                $ancestorNames = array_merge($ancestorNames, $this->getClassLikeAncestorNames($classLike->extends));
+        if ($classOrName instanceof Class_) {
+            if ($classOrName->extends instanceof Name) {
+                $ancestorNames[] = $this->nodeNameResolver->getName($classOrName->extends);
+                $ancestorNames = array_merge($ancestorNames, $this->getClassLikeAncestorNames($classOrName->extends));
             }
 
-            foreach ($classLike->implements as $implement) {
+            foreach ($classOrName->implements as $implement) {
                 $ancestorNames[] = $this->nodeNameResolver->getName($implement);
                 $ancestorNames = array_merge($ancestorNames, $this->getClassLikeAncestorNames($implement));
             }
diff --git a/rules-tests/Php80/Rector/Class_/StringableForToStringRector/Fixture/extends_with_interface.php.inc b/rules-tests/Php80/Rector/Class_/StringableForToStringRector/Fixture/extends_with_interface.php.inc
new file mode 100644
index 00000000000..84198383e37
--- /dev/null
+++ b/rules-tests/Php80/Rector/Class_/StringableForToStringRector/Fixture/extends_with_interface.php.inc
@@ -0,0 +1,31 @@
+<?php
+
+namespace Rector\Tests\Php80\Rector\Class_\StringableForToStringRector\Fixture;
+
+use Rector\Tests\Php80\Rector\Class_\StringableForToStringRector\Source\ParentInterfaceWithStringable;
+
+final class ExtendsWithInterface implements ParentInterfaceWithStringable
+{
+    public function __toString()
+    {
+        return 'I can stringz';
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\Tests\Php80\Rector\Class_\StringableForToStringRector\Fixture;
+
+use Rector\Tests\Php80\Rector\Class_\StringableForToStringRector\Source\ParentInterfaceWithStringable;
+
+final class ExtendsWithInterface implements ParentInterfaceWithStringable
+{
+    public function __toString(): string
+    {
+        return 'I can stringz';
+    }
+}
+
+?>
\ No newline at end of file
diff --git a/rules-tests/Php80/Rector/Class_/StringableForToStringRector/Fixture/parent_child_return_string.php.inc b/rules-tests/Php80/Rector/Class_/StringableForToStringRector/Fixture/parent_child_return_string.php.inc
new file mode 100644
index 00000000000..560a4bb50f2
--- /dev/null
+++ b/rules-tests/Php80/Rector/Class_/StringableForToStringRector/Fixture/parent_child_return_string.php.inc
@@ -0,0 +1,43 @@
+<?php
+
+namespace Rector\Tests\Php80\Rector\Class_\StringableForToStringRector\Fixture;
+
+class ParentChildReturnString
+{
+    public function __toString()
+    {
+        return 'I can stringz';
+    }
+}
+
+class SomeChildReturnParentChildReturnString extends ParentChildReturnString
+{
+    public function __toString()
+    {
+        return 'I can stringz';
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\Tests\Php80\Rector\Class_\StringableForToStringRector\Fixture;
+
+class ParentChildReturnString implements \Stringable
+{
+    public function __toString(): string
+    {
+        return 'I can stringz';
+    }
+}
+
+class SomeChildReturnParentChildReturnString extends ParentChildReturnString
+{
+    public function __toString(): string
+    {
+        return 'I can stringz';
+    }
+}
+
+?>
diff --git a/rules-tests/Php80/Rector/Class_/StringableForToStringRector/Fixture/skip_extends_with_interface.php.inc b/rules-tests/Php80/Rector/Class_/StringableForToStringRector/Fixture/skip_extends_with_interface.php.inc
deleted file mode 100644
index c5c672647a6..00000000000
--- a/rules-tests/Php80/Rector/Class_/StringableForToStringRector/Fixture/skip_extends_with_interface.php.inc
+++ /dev/null
@@ -1,13 +0,0 @@
-<?php
-
-namespace Rector\Tests\Php80\Rector\Class_\StringableForToStringRector\Fixture;
-
-use Rector\Tests\Php80\Rector\Class_\StringableForToStringRector\Source\ParentInterfaceWithStringable;
-
-final class SkipExtendsWithInterface implements ParentInterfaceWithStringable
-{
-    public function __toString()
-    {
-        return 'I can stringz';
-    }
-}
diff --git a/rules/Php80/Rector/Class_/StringableForToStringRector.php b/rules/Php80/Rector/Class_/StringableForToStringRector.php
index fd7ea95afb8..072b7363281 100644
--- a/rules/Php80/Rector/Class_/StringableForToStringRector.php
+++ b/rules/Php80/Rector/Class_/StringableForToStringRector.php
@@ -104,18 +104,17 @@ public function refactor(Node $node): ?Node
         // warning, classes that implements __toString() will return Stringable interface even if they don't implemen it
         // reflection cannot be used for real detection
         $classLikeAncestorNames = $this->familyRelationsAnalyzer->getClassLikeAncestorNames($node);
-
-        if (in_array(self::STRINGABLE, $classLikeAncestorNames, true)) {
-            return null;
-        }
+        $isAncestorHasStringable = in_array(self::STRINGABLE, $classLikeAncestorNames, true);
 
         $returnType = $this->returnTypeInferer->inferFunctionLike($toStringClassMethod);
         if (! $returnType->isString()->yes()) {
             $this->processNotStringType($toStringClassMethod);
         }
 
-        // add interface
-        $node->implements[] = new FullyQualified(self::STRINGABLE);
+        if (! $isAncestorHasStringable) {
+            // add interface
+            $node->implements[] = new FullyQualified(self::STRINGABLE);
+        }
 
         // add return type
         if ($toStringClassMethod->returnType === null) {
diff --git a/src/PhpParser/AstResolver.php b/src/PhpParser/AstResolver.php
index 3885ea07c6a..545b43ab272 100644
--- a/src/PhpParser/AstResolver.php
+++ b/src/PhpParser/AstResolver.php
@@ -62,6 +62,9 @@ public function __construct(
     ) {
     }
 
+    /**
+     * @api downgrade
+     */
     public function resolveClassFromName(string $className): Class_ | Trait_ | Interface_ | Enum_ | null
     {
         if (! $this->reflectionProvider->hasClass($className)) {