Placing restrictions on alcohol makes it "more desirable" so children should be given the occasional small sip of wine or beer so it loses its allure, a mother of two told Good Morning Britain.
Bea Marshal admitted to giving her eight and nine-year-old boys a sip of wine at dinner if they asked for it as it was a common reaction to naturally want to drink more if alcohol was forbidden.
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The man, in his thirties, was found with stab injuries on the upper deck of a bus in Handsworth, Birmingham, on Monday night.
Thousands of passengers now face delays, with Southeastern trains warning "all services" would be affected.
Paramedics attended a scene in Willesden, north-west London, on Monday afternoon where they found the teenager with stab wounds.