Becky Crandley said her son went bright red with embarrassment when she walked into his class.
A mum took matters into her own hands and gate-crashed her son's maths lesson to crack down on his rude behaviour towards teachers.
She said: "It all started last year with his behaviour change, it's part of growing up I think, but its his rudeness and disrespect I cannot stand. The brave mum has always threatened her son that she would come into school but acted on her word last week. The mother-of-five added: "I constantly threatened that I'd sit with him in school if needed, and he always laughed it off.
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