J Query Toggle sub menus not working as desired

I have a function that toggles a sub-menu when the parent is clicked.  This works fine.  However, if I click on another menu choice (parent) the sub-menu toggles open but the prior sub-menu that was toggled open stays open.  What I want is for each toggled sub-men closes if another parent is clicked so only one sub-menu is open at a time.

$("#menu-mobile .sub-menu").hide();
   
$('#menu-mobile').children().click(function(){
    $(this).children('.sub-menu').slideToggle('slow'); 
});

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