$("#demo").parent(); // accessing direct parent
$("span").parent().hide(); // changing parent color
$("#demo").parents(); // all ancestors of the element
$("#demo").parentsUntil("#demo2"); // all ancestors between two - demo is inside demo2
$("#demo").children(); // all direct children
$("#demo").children(".first"); // all direct children having a specified class
$("#demo").find("span"); // all span elements inside #demo
$("#demo").find("*"); // all descendants
$("#demo").siblings("span"); // span siblings of #demo
$("#demo").next(); // the next sibling
$("p").nextAll(); // all next siblings
$("#demo").nextUntil("#demo2"); // siblings between two arguments
$("#demo").prev(); // the previous sibling
$("p").prevAll(); // all previous siblings
$("#demo").prevUntil("#demo2"); // previous siblings between two arguments