Like this:
@Html.DisplayFor(m => m.Children, "YourTemplateName")
or like this:
[UIHint("YourTemplateName")]
public IEnumerable<ChildModel> Children { get; set; }
where obviously you would have ~/Views/Shared/DisplayTemplates/YourTemplateName.cshtml
:
@model IEnumerable<ChildModel>
<table>
<tr>
<th>Property 1</th>
<th>Property 2</th>
</tr>
...
</table>