To hide the child, you need a structure like this:
#parent:hover .yourchild {
display:none;
}
Where #parentis your external divand has an action :hover, then you just map the child to hide it.
In this case, I think you have a structure like this:
<div class="fullwrap">
<div>One</div>
<div>Two</div>
<div>Three</div>
</div>
Then, to hide the child, you can do the following:
.fullwrap:hover :nth-child(1) {
display: none;
}
Check out this demo http://jsfiddle.net/55TWN/
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