I would say that sometimes a hen will be friendlier to her offspring after weaning.... In the past I had two hens who brooded chicks at the same time and even more than a year later, the hens still prefer the chicks that were theirs over the chicks that were mothered by the other hen....
I think that some of you are confusing the existing pecking order interactions between a hen and her own chicks.
The pecking order involves issues like how close the subordinate, Beta, or young chicken is allowed to approach the older or Alfa bird. A settled pecking order relationship may be viewed by some as family affection but it just 'aint' so.
Remove the younger birds from the flock and then reintroduce the now adult chickens to their mommie 6 months later and see what happens.
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