Laravel 8 retrieving data from multiple models using with() returning empty arrays for related models

Question

I'm using laravel 8, trying to retrieve data from related models which returns empty arrays except for the parent model.
I have 4 models

1. Product (Parent)
2. Product_categories
3. Product_attributes
4. Product_photos

I'm fetching the data like this

$product = Product::select('name', 'description', 'price')
                          ->with(['categories' => function($query){
                                   $query->select(['category_id']);
                          }, 'attributes' => function($query){
                                   $query->select(['attribute_key',
                                                   'attribute_value']);
                          }, 'photos' => function($query){
                                   $query->select(['photo_path']);
                          }])
                          ->find($id);
return response()->json([$product]);

Product Model

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class Product extends Model
{
    use HasFactory;
    protected $fillable = [
        'name',
        'user_id',
        'description',
        'price',
        'discount',
        'status'
    ];      

    /**
     * Get the photos of the product.
     */
    public function photos()
    {
        return $this->hasMany('App\Models\Product_photos');
    }

    /**
     * Get the attriutes of the product.
     */    
    public function attributes()
    {
        return $this->hasMany('App\Models\Product_attributes');
    }

    /**
     * Get the categories of the product.
     */
    public function categories()
    {
        return $this->hasMany('App\Models\Product_categories');
    }
}

And this is the response I'm getting

[
    {
        "name": "Fendi FF motif zip-up hoodie",
        "description": "sample description",
        "price": 480,
        "categories": [],
        "attributes": [],
        "photos": []
    }
]

Any help would be appreciable