i made a hover-able flex-box nav which contains some parents, some children and probably some grand-children (children has child themselves), I'm looking for a way to make child's height with inner child grow automatically while other children doesn't change.
this is my result:

as you can see "child2" has no inner child but their height increase too. i want "child2" height stay fix while there is no inner child.
this is my code:
nav{
direction:rtl;
}
.menu-dropdown {
display: flex;
flex-direction: row;
justify-content: flex-start;
}
.menu-dropdown-parent {
list-style-type: none;
margin: auto 25px;
}
.menu-dropdown-child-container li{
display: none;
}
.menu-dropdown-parent:hover .menu-dropdown-child-container li{
display: flex;
flex-direction: column;
justify-content: flex-start;
margin: 5px 20px;
}
.menu-dropdown{
height: 40px;
background-color: #f3f0e9;
}
.menu-dropdown-child-container{
display: flex;
flex-direction: row;
justify-content: flex-start;
position: absolute;
right: 0px;
width: 100%;
margin-top: 8px;
padding: 0px;
flex-wrap: wrap;
text-align: right;
}
.menu-dropdown-grandChild-container{
display: flex;
flex-direction: column;
justify-content: flex-start;
padding: 0px;
}
<nav>
<div class="menu-container">
<ul class="menu-dropdown">
<li class="menu-dropdown-parent">parent1
<ul class="menu-dropdown-child-container">
<li>child1
<ul class="menu-dropdown-grandChild-container">
<li>grandchild</li>
<li>grandchild</li>
<li>grandchild</li>
<li>grandchild</li>
<li>grandchild</li>
</ul>
</li>
<li>child2</li>
<li>child2</li>
<li>child2</li>
<li>child2</li>
<li>child2</li>
<li>child2</li>
<li>child2</li>
<li>child2</li>
<li>child2</li>
<li>child2</li>
<li>child2</li>
<li>child2</li>
<li>child2</li>
<li>child2</li>
<li>child2</li>
<li>child2</li>
<li>child2</li>
<li>child2</li>
<li>child2</li>
<li>child2</li>
<li>child2</li>
<li>child2</li>
</ul>
</li>
<li class="menu-dropdown-parent">parent2
<ul class="menu-dropdown-child-container">
<li>parent2-child</li>
<li>parent2-child</li>
<li>parent2-child</li>
<li>parent2-child</li>
<li>parent2-child</li>
<li>parent2-child</li>
<li>parent2-child</li>
<li>parent2-child</li>
<li>parent2-child</li>
<li>parent2-child</li>
<li>parent2-child</li>
<li>parent2-child</li>
<li>parent2-child</li>
<li>parent2-child</li>
<li>parent2-child</li>
</ul>
</li>
<li class="menu-dropdown-parent">parent3</li>
<li class="menu-dropdown-parent">parent4</li>
<li class="menu-dropdown-parent">parent5</li>
<li class="menu-dropdown-parent">parent6</li>
<li class="menu-dropdown-parent">parent7</li>
</ul>
</div>
</nav>
this is what i am looking for

