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[neduhamel]

i'm sorry, i feel like if i do as you say, it's gonna create a endless loop as the child will have a member which is the parent which has a child which has a parent....and so on. Am i wrong?
Here's what i understand from your advice:

//class_A.h
//-----------
@interface class_A 
{	
@public
    class_B my_class_B;  
}
-(void)init;
@end

//class_A.m
//-----------
@implementation class_A
	
-(void) init
{
    [my_class_B initWithParent:self]; //is this ok?
}

@end

//class_B.h
//------------
@interface class_B
{
@private
    class_A my_parent;  //This what i doubt is good...
}
-(void) initWithParent: (id) parent;
@end

//class_B.m
//------------
@implementation class_B

-(void) initWithParent: (id) parent
{
     self=[super init];
     if (self){
          my_parent=parent;
     }
     return self;
}

@end