# Siblings collection

> Feature introduced in Broadcast 3.5

The second required metafield is **`theme.siblings`** 

```
theme.siblings
```

For the content type, select 'Single line text' and choose the 'One value' option.

This metafield maps each product to the correct collection handle for the siblings.

Start by defining a new Product metafield. You can name it 'Siblings' so that you can more easily find it later.

{% hint style="info" %}
Important steps:

* Change the namespace from '**custom'** to '**theme**'.
* Set the key to '**siblings**'.
  {% endhint %}

Adding a description is optional but be sure to select the correct content type. Choose 'Single line text**'** and set it to 'One value**'**:

<figure><img src="https://content.gitbook.com/content/j8jzXN4KKXAfQhgbN5lO/blobs/uv3V3AtfQBOUgxHRCUjh/Kapture%202022-10-06%20at%2015.53.582.gif" alt=""><figcaption></figcaption></figure>

**Save** the definition.&#x20;

### Check the saved metafield

Your second metafield should look like this:

<figure><img src="https://content.gitbook.com/content/j8jzXN4KKXAfQhgbN5lO/blobs/LvI773rhKPAuEOJ9IicI/Screen%20Shot%202022-10-06%20at%203.56.16%20PM.png" alt=""><figcaption></figcaption></figure>

{% hint style="info" %}
Please ensure you change the Namespace and key to this custom version for Broadcast:\
\
\&#xNAN;**`theme.siblings`**\
\
By default, the namespace begins with '**custom'**. This namespace will not be recognized by Broadcast. You have to change it to '**theme**'.

This is a good distinction to make and it helps keep your store, custom, theme, and app metafields separate.
{% endhint %}

### Product setup

Next, we will use these newly defined metafields in the Product Setup for each product:

{% content-ref url="siblings-product-setup" %}
[siblings-product-setup](https://broadcast.presidiocreative.com/broadcast-v5/siblings/product-siblings/siblings-product-setup)
{% endcontent-ref %}