How to obtain nodes such as brothers and father -in -law

var chils = s.Childnodes; // get all the sub -nodes of s

Var Par = s.parentnode; // Get S's parent node

var ns = s.nextsbiling; // Get S's next brother node

var ps = s.Previouussbiling; // get the previous brother node of S

var fc = s.fringchild; // Get the first sub -node of S

var lc = s.lastchile; // Get the last sub -node of S