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Is it possible to bind a property to the container of the Decorated item?

In my WPF application, we use an advertiser to display validation messages, in the specific case there is a single-row grid that has several controls, some of which have validation. The problem I am facing is that I want the width of the error message control to be the same as the grid, but cannot find a way to refer to this grid from the adorner template. Here is an example of what I tried:

<ControlTemplate x:Key="Local_TopAdornedTemplateWide">
    <StackPanel>
        <AdornedElementPlaceholder x:Name="adornedElement"/>
        <TextBlock MaxWidth="{Binding Path=ActualWidth, RelativeSource={RelativeSource FindAncestor, AncestorType=Grid}, ElementName=adornedElement}"
                   TextWrapping="Wrap"
                   Text="{Binding Converter={StaticResource Local_ValidationErrorMessageConverter}}" 
                   Style="{DynamicResource Error_Text}" 
                   Padding="2 1 0 0" 
                   Visibility="{Binding ElementName=adornedElement, Mode=OneWay, Path=AdornedElement.IsVisible, Converter={StaticResource BooleanToVisibilityConverter}}"
                   />
    </StackPanel>
</ControlTemplate>

This causes the application to crash using the XamlParseException.

Ideally, the solution would not be grid specific to get the width of any type of container, but now the grid is the only use case.

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 <ControlTemplate x:Key="Local_TopAdornedErrorTemplate">
        <StackPanel>
            <AdornedElementPlaceholder x:Name="adornedElement"/>
            <TextBlock MaxWidth="{Binding ElementName=adornedElement, Path=ActualWidth}"
                       TextWrapping="Wrap"
                       Text="{Binding Converter={StaticResource Local_ValidationErrorMessageConverter}}" 
                       Style="{DynamicResource Error_Text}" 
                       Padding="2 1 0 0" 
                       Visibility="{Binding ElementName=adornedElement, Mode=OneWay, Path=AdornedElement.IsVisible, Converter={StaticResource BooleanToVisibilityConverter}}"
                       />
        </StackPanel>
    </ControlTemplate>

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MaxWidth="{Binding ElementName=adornedElement, 
                   Mode=OneWay, 
                   Path=AdornedElement.Parent.ActualWidth}"
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