Our expert says:
Breaking bad habits is difficult. I don't know what I say "bad" because one rarely tries to break a good habit.
Remind him this is not a competition. Your parents are loving and good grandparentsm abd would be so wither the other grandparents were monsters or had won the Nobel Prize for Grandparenting. His parents presumably do their best, its just that they really don't understand how to do it well.
Its not an issue of "Not interfering", just of supporting and encouraging the best aspects of how your husband has been responding, to encourage more of that, and to discourage him from focussing only on an inappropriate senese of failure.
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