I would say yes...but life has moved on.
All I can reiterate, is that it was firm, simple boundaries that worked, imo, and that what struck me most, was that you felt, as a parent that
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You weren't alone
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That he was, as equally on the side of the child, as with you, the parent.
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That this may not be insurmountable, so made you feel as if you were dealing effectively with behaviour, but within a very loving environment. He validated parents' frustration as much as he understood the child's.
I will never forget that.
But I also understand that some parents now, may feel that it is outside what they are prepared to do.
If my eldest had children, I would absolutely accept if she did not want to apply/espouse his techniques...they were firm! However, some would say we need to return to more firm techniques, others not.
I also liked the Steve Biddulph book, Raising boys...and although v American, I thought the 'How to talk' books very v good, as they got older.
So I fished about and used a variety of books, depending on age etc...
All the best @Louisa30 Its not easy, but that you are exploring books/techniques shows you are interested, insightful and proactive, always good!