Ok. I get the picture now. (Sounds like a goofy design to me, but whatever.) 
package myParent;
our @ISA;

sub new {
  my $class = shift;
  bless $self,$class;
  $self->_parent_init(@_);
  return $self;
}
sub _parent_init {
  my $self = shift;
  print "_initParent (@_)\n";
}

#----------------------------------

package myChild;
our @ISA;
use base qw(myParent);

sub new {
  my $class = shift;
  my $self = $class->SUPER::new;
  $self->_child_init(@_);
  return $self;
}

sub _child_init {
  my $self = shift;
  print "_initChild (@_)\n";
}

[download]
Etc. The idea is that your constructor is a wrapper on your parent's constructor, but you do additional things after that's called. So, the delta off your original code is that there is only one bless - in the ultimate parent's code. (You were doing a bunch of reblessing, which I think was confusing you.)

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Please remember that I'm crufty and crochety. All opinions are purely mine and all code is untested, unless otherwise specified.

In reply to Re2: maintaining constructor inheritance cascade by dragonchild
in thread maintaining constructor inheritance cascade by jaa

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