> For the complete documentation index, see [llms.txt](https://broadcast.presidiocreative.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://broadcast.presidiocreative.com/broadcast-v3/siblings/siblings-metafields/siblings-collection.md).
# Siblings collection
> Feature introduced in Broadcast 3.5
The second required metafield is **`theme.siblings`**
```
theme.siblings
```
The **content type** is: Single line text and One value.
This metafield maps each product to the correct collection handle for the siblings.
Start by defining a **Products** metafield and name it **Siblings**. Then change the Namespace from `custom` to `theme` and the key to simply `siblings`.
{% hint style="info" %}
Important steps:
* Rename **`custom`** to **`theme`**
* The key should be **`siblings`**
{% endhint %}
Next, add a description. You can name this one *Collection handle for siblings*. Then click on **Select content type** and choose **Single line text** and **One value**:
**Save** the definition.
### Check the saved metafield
Your second metafield should look like this:
{% hint style="success" %}
Please ensure you change the Namespace and key to this custom version for Pipeline:\
\
\&#xNAN;**`theme.siblings`**\
\
By default, the namespace begins with **`custom`**. This will need to be changed to **`theme`**
{% endhint %}
### Product setup
Next, we will use these newly defined metafields in the Product Setup for each product:
{% content-ref url="/pages/3AzWzLNIuo8fNMSH5s0P" %}
[Siblings product setup](/broadcast-v3/siblings/siblings-product-setup.md)
{% endcontent-ref %}
---
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