Create a lists of categories and their subcatgory in Laravel 5

i have three table as category,subcategory and subcategory_category that i store foreign key of other table in it i want to show a list with category and subcategory same as:

• category1

  • subcategory1

  • subcategory2

• category2

  • subcategory3

  • subcategory4

i try this it is not ok in my controller:

$mycategories = SubcategoriesCategories::with('parent')->with('children2')->get();

and in model:

class SubcategoriesCategories extends Model  {
protected $table = 'subcategories_to_categories';
public function parent()
{
    return $this->belongsTo('App\categories', 'categories_id');
}
    public function children2()
{
    return $this->belongsTo('App\subcategories', 'subcategories_id');
}

via Chebli Mohamed