You need to use .addBack() to get both the div and its siblings. In jQuery versions earlier than 1.8, you should use .andSelf() instead, which is now just an alias for .addBack() (thanks Sable).

// jQuery 1.8+
$("#myDiv").siblings().addBack();

// jQuery <1.8
$("#myDiv").siblings().andSelf();

• http://api.jquery.com/addBack/
• http://api.jquery.com/andSelf/

This maybe?

$('div').add($(this).siblings('*'));

for animation you can use animate and for adding the siblings please specify whether you want to add the siblings to the jQuery object or to the element itself?