Everyone in my family could be described as inflexible - particularly when stressed.
I've had great improvement with
Transforming the Difficult Child Workbook: An Interactive Guide to The Nurtured Heart Approach by Lisa Bravo, Howard Glasser
I love making a big fuss when DS or DH does even the littlest flex and praising their flexibility. I like those irrefutable moments of strength - and lecture on and on about it, even when I see DS start to squirm.
Smiles,
Grinity
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Coaching available, at SchoolSuccessSolutions.com