I have a form that looks like this:

form = formGroup({

  name:FormControl(''),
  adress:new FormGroup({
    city: new FOrmControl(''),
  })

})

and I use two components

parent:

<form [formGroup]="form" (ngSubmit)="submit()">
  <input matInput formControlName="name">
  <child-component [group]="form.controls.adress"><child-component/>
</form>

child:

<form [formGroup]="group">
  <input matInput formControlName="city">
</form>

Now my problem is that when I submit the form and city is invalid, the red underline doesn’t show.
How can submit have an effect on both parent and child?