Angular FormGroup disabled parent with invalid childern

Are the child controllers dynamically loaded and are you using it with Material then their is a bug they still have not fixed where child errors don't propagate to parent form with mat-error when submitting form.

In general If you are using reactive forms you can get hold of the parent form and add validation error to it, either by subscribing to the forms eventChange and testing it for child errors or by creating a ValidatorFn and adding the custom validator to the child controls and if an error occur they can set an error on their parent form

Example: child controller validation function:

 passwordVerifyTest(): ValidatorFn {
    return (control: AbstractControl): ValidationErrors | null => {
      const verifyPassword = control.value;
      if (verifyPassword === 'error') {
        control.parent.setErrors({'formInvalid': true});    
        return {passwordInavlid: true};
      }

      return null;
    };
  }