title: Non-ARC implementation Query
body: <p>Apple document Advanced Memory Management Programming Guide state that - </p>
  
  <p><a href="https://developer.apple.com/library/mac/documentation/cocoa/conceptual/memorymgmt/Articles/mmPractical.html#//apple_ref/doc/uid/TP40004447-1000810" rel="nofollow">"a 'parent' object should maintain strong references to its 'children', and that the children should have weak references to their parents"</a></p>
  
  <p>Implementation of this is understood while using ARC. How am I supposed to implement it when I am not using ARC.</p>