The 66-year-old claims their son JULIAN was left mentally scarred by Lennon's neglect and unreasonable behaviour.
And she believes one incident in particular traumatised him so much he has rarely laughed since for fear of reprisals
She tells, "The whole family had been fooling around when Julian giggled.
"John turned on him and screamed: 'I can't stand the way you f**king laugh! Never let me hear your f**king horrible laugh again.'
"Julian fled to his room in tears."