diff --git a/src/Bundle/ChillPersonBundle/Entity/Person.php b/src/Bundle/ChillPersonBundle/Entity/Person.php
index 0ec04bf35..5373f0420 100644
--- a/src/Bundle/ChillPersonBundle/Entity/Person.php
+++ b/src/Bundle/ChillPersonBundle/Entity/Person.php
@@ -1209,6 +1209,20 @@ class Person implements HasCenterInterface
         return $this->householdParticipations;
     }
 
+    public function getHouseholdParticipationsShareHousehold(): Collection
+    {
+        $criteria = new Criteria();
+        $expr = Criteria::expr();
+
+        $criteria->where(
+            $expr->eq('shareHousehold', true)
+        );
+
+        return $this->getHouseholdParticipations()
+            ->matching($criteria)
+            ;
+    }
+
     public function getCurrentHousehold(?\DateTimeImmutable $at = null): ?Household
     {
         $criteria = new Criteria();
diff --git a/src/Bundle/ChillPersonBundle/Household/MembersEditor.php b/src/Bundle/ChillPersonBundle/Household/MembersEditor.php
index 37db3626f..5a131ec7f 100644
--- a/src/Bundle/ChillPersonBundle/Household/MembersEditor.php
+++ b/src/Bundle/ChillPersonBundle/Household/MembersEditor.php
@@ -19,6 +19,8 @@ class MembersEditor
     private array $persistables = [];
     private array $membershipsAffected = [];
 
+    public const VALIDATION_GROUP = 'household_memberships';
+
     public function __construct(ValidatorInterface $validator, ?Household $household)
     {
         $this->validator = $validator;
@@ -41,12 +43,12 @@ class MembersEditor
         $this->household->addMember($membership);
 
         if ($position->getShareHousehold()) {
-            foreach ($person->getHouseholdParticipations() as $participation) {
-                if (FALSE === $participation->getShareHousehold()) {
+            foreach ($person->getHouseholdParticipationsShareHousehold() as $participation) {
+                if ($participation === $membership) {
                     continue;
                 }
 
-                if ($participation === $membership) {
+                if ($participation->getStartDate() > $membership->getStartDate()) {
                     continue;
                 }
 
@@ -92,7 +94,13 @@ class MembersEditor
 
     public function validate(): ConstraintViolationListInterface
     {
-        return $this->validator->validate($this->getHousehold(), null, [ "memberships" ]);
+        $list = $this->validator->validate($this->getHousehold(), null, [ self::VALIDATION_GROUP ]);
+
+        foreach ($this->membershipsAffected as $m) {
+            $list->addAll($this->validator->validate($m, null, [ self::VALIDATION_GROUP ]));
+        }
+
+        return $list;
     }
 
     public function getPersistable(): array
diff --git a/src/Bundle/ChillPersonBundle/Validator/Constraints/Household/HouseholdMembershipSequentialValidator.php b/src/Bundle/ChillPersonBundle/Validator/Constraints/Household/HouseholdMembershipSequentialValidator.php
index 7c8bc6967..a14127e6f 100644
--- a/src/Bundle/ChillPersonBundle/Validator/Constraints/Household/HouseholdMembershipSequentialValidator.php
+++ b/src/Bundle/ChillPersonBundle/Validator/Constraints/Household/HouseholdMembershipSequentialValidator.php
@@ -29,7 +29,7 @@ class HouseholdMembershipSequentialValidator extends ConstraintValidator
             throw new UnexpectedTypeException($constraint, Person::class);
         }
 
-        $participations = $person->getHouseholdParticipations();
+        $participations = $person->getHouseholdParticipationsShareHousehold();
 
         if ($participations->count() === 0) {
             return;
@@ -47,6 +47,7 @@ class HouseholdMembershipSequentialValidator extends ConstraintValidator
         if ($covers->hasIntersections()) {
             foreach ($covers->getIntersections() as list($start, $end, $metadata)) {
                 $participation = $participations[$metadata[0]];
+                $nbHousehold = count($metadata);
 
                 $this->context
                     ->buildViolation("household_membership.Person with membership covering")
@@ -55,7 +56,9 @@ class HouseholdMembershipSequentialValidator extends ConstraintValidator
                             $participation->getPerson(), []
                         ),
                         // TODO when date is correctly i18n, fix this
-                        '%from%' => $start->format('d-m-Y')
+                        '%from%' => $start->format('d-m-Y'),
+                        '%nbHousehold%' => $nbHousehold,
+
                     ])
                     ->addViolation()
                     ;
diff --git a/src/Bundle/ChillPersonBundle/translations/validators.fr.yml b/src/Bundle/ChillPersonBundle/translations/validators.fr.yml
index 82b5115d7..0e77dae0c 100644
--- a/src/Bundle/ChillPersonBundle/translations/validators.fr.yml
+++ b/src/Bundle/ChillPersonBundle/translations/validators.fr.yml
@@ -40,4 +40,4 @@ household:
     max_holder_overflowed: Il ne peut y avoir plus de deux titulaires simultanément. Or, avec cette modification, ce nombre sera dépassé entre le {{ start }} et le {{ end }}.
 household_membership:
     The end date must be after start date: La date de la fin de l'appartenance doit être postérieure à la date de début.
-    Person with membership covering: Une personne ne peut pas appartenir à deux ménages simultanément. Or, avec cette modification, %person_name% appartiendrait à deux ménages à partir du %from%.
+    Person with membership covering: Une personne ne peut pas appartenir à deux ménages simultanément. Or, avec cette modification, %person_name% appartiendrait à %nbHousehold% ménages à partir du %from%.