To target a nested element and make sure it is the only one showing, you would need to hide its siblings, as well as the siblings of all its ancestors until the <body>.
Example: http://jsfiddle.net/patrick_dw/gSXYa/1/
$('#target').show().parentsUntil('body').andSelf().siblings().hide();
EDIT: The solution I added above is a little more concise.
Example: http://jsfiddle.net/patrick_dw/gSXYa/
var target = $('#target').show();
target = target.add(target.parentsUntil('body')).siblings().hide();
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