diff --git a/src/Bundle/ChillPersonBundle/Controller/HouseholdMemberController.php b/src/Bundle/ChillPersonBundle/Controller/HouseholdMemberController.php
index 85e1c86b6..d58972a93 100644
--- a/src/Bundle/ChillPersonBundle/Controller/HouseholdMemberController.php
+++ b/src/Bundle/ChillPersonBundle/Controller/HouseholdMemberController.php
@@ -159,7 +159,9 @@ class HouseholdMemberController extends ApiController
     {
         // TODO ACL
 
-        $form = $this->createForm(HouseholdMemberType::class, $member);
+        $form = $this->createForm(HouseholdMemberType::class, $member, [
+            'validation_groups' => [ 'household_memberships' ] 
+        ]);
         $form->handleRequest($request);
 
         if ($form->isSubmitted() && $form->isValid()) {
diff --git a/src/Bundle/ChillPersonBundle/Entity/Household/Household.php b/src/Bundle/ChillPersonBundle/Entity/Household/Household.php
index 349083fcb..1036481b7 100644
--- a/src/Bundle/ChillPersonBundle/Entity/Household/Household.php
+++ b/src/Bundle/ChillPersonBundle/Entity/Household/Household.php
@@ -19,7 +19,7 @@ use Chill\PersonBundle\Validator\Constraints\Household\MaxHolder;
  * @Serializer\DiscriminatorMap(typeProperty="type", mapping={
  *    "household"=Household::class
  * })
- * @MaxHolder(groups={"memberships"})
+ * @MaxHolder(groups={"household_memberships"})
  */
 class Household
 {
diff --git a/src/Bundle/ChillPersonBundle/Entity/Household/HouseholdMember.php b/src/Bundle/ChillPersonBundle/Entity/Household/HouseholdMember.php
index b891bbc15..611a9e84f 100644
--- a/src/Bundle/ChillPersonBundle/Entity/Household/HouseholdMember.php
+++ b/src/Bundle/ChillPersonBundle/Entity/Household/HouseholdMember.php
@@ -7,6 +7,7 @@ use Chill\PersonBundle\Entity\Person;
 use Chill\PersonBundle\Entity\Household\Household;
 use Chill\PersonBundle\Entity\Household\Position;
 use Symfony\Component\Serializer\Annotation as Serializer;
+use Symfony\Component\Validator\Constraints as Assert;
 
 
 /**
@@ -28,18 +29,25 @@ class HouseholdMember
     /**
      * @ORM\ManyToOne(targetEntity=Position::class)
      * @Serializer\Groups({"read"})
+     * @Assert\NotNull(groups={"household_memberships"})
      */
     private ?Position $position = null;
 
     /**
      * @ORM\Column(type="date_immutable", nullable=true, options={"default": null})
      * @Serializer\Groups({"read"})
+     * @Assert\NotNull(groups={"household_memberships"})
      */
     private ?\DateTimeImmutable $startDate = null;
 
     /**
      * @ORM\Column(type="date_immutable", nullable= true, options={"default": null})
      * @Serializer\Groups({"read"})
+     * @Assert\GreaterThan(
+     *      propertyPath="startDate",
+     *      message="household_membership.The end date must be after start date",
+     *      groups={"household_memberships"}
+     * )
      */
     private ?\DateTimeImmutable $endDate = null;
 
@@ -67,6 +75,8 @@ class HouseholdMember
      *  targetEntity="\Chill\PersonBundle\Entity\Person"
      * )
      * @Serializer\Groups({"read"})
+     * @Assert\Valid(groups={"household_memberships"})
+     * @Assert\NotNull(groups={"household_memberships"})
      */
     private ?Person $person = null;
 
@@ -76,6 +86,8 @@ class HouseholdMember
      * @ORM\ManyToOne(
      *  targetEntity="\Chill\PersonBundle\Entity\Household\Household"
      * )
+     * @Assert\Valid(groups={"household_memberships"})
+     * @Assert\NotNull(groups={"household_memberships"})
      */
     private ?Household $household = null;
 
diff --git a/src/Bundle/ChillPersonBundle/Form/HouseholdMemberType.php b/src/Bundle/ChillPersonBundle/Form/HouseholdMemberType.php
index 44b364c56..4d8d5a165 100644
--- a/src/Bundle/ChillPersonBundle/Form/HouseholdMemberType.php
+++ b/src/Bundle/ChillPersonBundle/Form/HouseholdMemberType.php
@@ -35,7 +35,8 @@ class HouseholdMemberType extends AbstractType
         }
         $builder
             ->add('comment', ChillTextareaType::class, [
-                'label' => 'household.Comment'
+                'label' => 'household.Comment',
+                'required' => false
             ])
         ;
     } 
diff --git a/src/Bundle/ChillPersonBundle/Validator/Constraints/Household/HouseholdMembershipSequential.php b/src/Bundle/ChillPersonBundle/Validator/Constraints/Household/HouseholdMembershipSequential.php
new file mode 100644
index 000000000..00d9e3306
--- /dev/null
+++ b/src/Bundle/ChillPersonBundle/Validator/Constraints/Household/HouseholdMembershipSequential.php
@@ -0,0 +1,18 @@
+<?php
+
+namespace Chill\PersonBundle\Validator\Constraints\Household;
+
+use Symfony\Component\Validator\Constraint;
+
+/**
+ * @Annotation
+ */
+class HouseholdMembershipSequential extends Constraint
+{
+    public $message = 'household_membership.Person with membership covering';
+
+    public function getTargets()
+    {
+        return [ self::CLASS_CONSTRAINT ];
+    }
+}
diff --git a/src/Bundle/ChillPersonBundle/Validator/Constraints/Household/HouseholdMembershipSequentialValidator.php b/src/Bundle/ChillPersonBundle/Validator/Constraints/Household/HouseholdMembershipSequentialValidator.php
new file mode 100644
index 000000000..7c8bc6967
--- /dev/null
+++ b/src/Bundle/ChillPersonBundle/Validator/Constraints/Household/HouseholdMembershipSequentialValidator.php
@@ -0,0 +1,65 @@
+<?php
+
+namespace Chill\PersonBundle\Validator\Constraints\Household;
+
+use Chill\PersonBundle\Entity\Person;
+use Chill\MainBundle\Util\DateRangeCovering;
+use Chill\PersonBundle\Templating\Entity\PersonRender;
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+use Symfony\Component\Validator\Exception\UnexpectedTypeException;
+use Symfony\Component\Validator\Exception\UnexpectedValueException;
+
+/**
+ * Validate that a person does not belong to two household at 
+ * the same time
+ */
+class HouseholdMembershipSequentialValidator extends ConstraintValidator
+{
+    private PersonRender $render;
+
+    public function __construct(PersonRender $render)
+    {
+        $this->render = $render;
+    }
+
+    public function validate($person, Constraint $constraint)
+    {
+        if (!$person instanceof Person) {
+            throw new UnexpectedTypeException($constraint, Person::class);
+        }
+
+        $participations = $person->getHouseholdParticipations();
+
+        if ($participations->count() === 0) {
+            return;
+        }
+
+        $covers = new DateRangeCovering(1, $participations[0]
+            ->getStartDate()->getTimezone());
+
+        foreach ($participations as $k => $p) {
+            $covers->add($p->getStartDate(), $p->getEndDate(), $k);
+        }
+
+        $covers->compute();
+
+        if ($covers->hasIntersections()) {
+            foreach ($covers->getIntersections() as list($start, $end, $metadata)) {
+                $participation = $participations[$metadata[0]];
+
+                $this->context
+                    ->buildViolation("household_membership.Person with membership covering")
+                    ->setParameters([
+                        '%person_name%' => $this->render->renderString(
+                            $participation->getPerson(), []
+                        ),
+                        // TODO when date is correctly i18n, fix this
+                        '%from%' => $start->format('d-m-Y')
+                    ])
+                    ->addViolation()
+                    ;
+            }
+        }
+    }
+}
diff --git a/src/Bundle/ChillPersonBundle/config/services.yaml b/src/Bundle/ChillPersonBundle/config/services.yaml
index 0f7ef3e1c..099b1d77c 100644
--- a/src/Bundle/ChillPersonBundle/config/services.yaml
+++ b/src/Bundle/ChillPersonBundle/config/services.yaml
@@ -57,6 +57,11 @@ services:
         tags:
             - { name: validator.constraint_validator, alias: birthdate_not_before }
 
+    Chill\PersonBundle\Validator\Constraints\Household\HouseholdMembershipSequentialValidator:
+        autowire: true
+        tags:
+            - { name: validator.constraint_validator }
+
     Chill\PersonBundle\Repository\:
         autowire: true
         autoconfigure: true
diff --git a/src/Bundle/ChillPersonBundle/config/validation.yaml b/src/Bundle/ChillPersonBundle/config/validation.yaml
index b9041ddb9..fb0dd7b50 100644
--- a/src/Bundle/ChillPersonBundle/config/validation.yaml
+++ b/src/Bundle/ChillPersonBundle/config/validation.yaml
@@ -61,6 +61,9 @@ Chill\PersonBundle\Entity\Person:
           - Callback:
                   callback: isAddressesValid
                   groups: [addresses_consistent]
+          - Chill\PersonBundle\Validator\Constraints\Household\HouseholdMembershipSequential:
+                  groups: [ 'household_memberships' ]
+
 
 Chill\PersonBundle\Entity\AccompanyingPeriod:
     properties:
diff --git a/src/Bundle/ChillPersonBundle/translations/validators.fr.yml b/src/Bundle/ChillPersonBundle/translations/validators.fr.yml
index 930494d58..82b5115d7 100644
--- a/src/Bundle/ChillPersonBundle/translations/validators.fr.yml
+++ b/src/Bundle/ChillPersonBundle/translations/validators.fr.yml
@@ -38,3 +38,6 @@ The date should not be empty: La date ne doit pas être vide
 household:
     max_holder_overflowed_infinity: Il ne peut pas y avoir plus de deux titulaires simultanément. Or, avec cette modification, ce nombre sera dépassé à partir du {{ start }}.
     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%.