In the ad, through Lowe, the pair, aged six and nine years old respectively, swap roles with their fathers. They walk down their pathways chatting about their families and their new cars, which are parked in their drives.
George gets into his family's Meriva, while Harry is on a cleaning mission, hoovering crumbs off the back seat of his family's Zafira.
The rest of George's family get into the car. Then, just as they are about to go out, the father hops out of the car, saying: "Hang on a minute."
Exasperated, George says to Harry: "Someone hasn't been to the toilet." To which Harry replies: "Typical."
The two cars flash on to the screen at the end as the voiceover ends the ad with the line: "Clever family cars from Vauxhall."
The 40-second TV ads break on 1 April and will be supported by radio slots concentrated during the morning and afternoon school runs.
Damon Collins, the creative director at Lowe, said: "Charm, which these ads use in abundance, is a very powerful selling tool. The boys are great little characters who demonstrate the cars' features in a disarming way."
The ads were written and art directed by Tom Hudson and Lee Goulding and were shot by Paul Weiland of The Paul Weiland Film Company. Media planning and buying is through Initiative Media.
Vauxhall promoted the Meriva last summer with the "two worlds" campaign, through Delaney Lund Knox Warren & Partners, while Lowe created the previous "daddy cool" school-run spots for the Zafira in 2002.