What do you get if you cross snarling punk icons The Sex Pistols and fresh-faced child popsters Hanson?

Young punks Xero Gravity could be the answer.

And the Worthing-based band go one better than the likes of Oasis, The Kinks and Hanson - creators of the hit Mmm Bop - by featuring not one but two sets of siblings.

The Lidbetter brothers Sean, 14, and Liam, 11, paired up with 11-year-old Chris and Tom Dunne, ten, at first with toy equipment but have now progressed to the real thing.

They hope to go into the recording studio for the first time soon but are first tackling another medium: The video "rockumentary".

The Dunne brothers' older cousin John Dolton was yesterday filming them for a documentary as part of a media studies assignment at Birmingham University.

The finished film will be broadcast on a Birmingham cable channel.

It may be humble beginnings but the pre-teen popsters and Sean hope it will be the first step towards emulating heroes such as the Pistols, Nirvana and The Foo Fighters.

Posters of late Nirvana frontman Kurt Cobain cover almost every inch of wall space in their session room - set up in the Dunne family's garage.

Yesterday's filming featured the band practising at Chatsmore Catholic High School and English Martyrs Primary School in Worthing.

The climax was to be a private concert at the Thomas Beecham Social Club last night, with a set including Nirvana's legendary Smells Like Teen Spirit.

Getting a taste for the limelight during their first photoshoot with The Argus, Sean said: "We're going to record an EP soon. Our friends like our songs and lots of them promised to come to the gig."

Liam said: "We set up this gig all by ourselves. We also get gigs at a church youth club and we played to a whole school at my leaving party from English Martyrs."

Brothers in bands have often been troublesome relationships.

Noel and Liam Gallagher invariably rage contemptuously at each other during interviews and The Kinks' Ray and Dave Davies often began on-stage brawls.

One violent clash ended with Dave just about managing to dodge a hurled cymbal which could have decapitated him.

But the Xero Gravity boys insist that, while brotherly love may often give way to brotherly rivalry, they take a mature approach to band decisions.

Chris admitted being brothers does spark the odd argument but said democracy was key.

He said: "Normally one of us will think something and we decide if it's a good idea."

Proud mothers Mandy Dunne and Sheila Lidbetter, from Worthing, try not to worry about the hundreds of pounds they have spent on getting their sons a PA system, drums, guitars and amplifiers.

Mrs Dunne said: "They first started the band before Christmas last year. They had a toy drum kit then. After Christmas they had proper instruments and now they want even more expensive ones.

"They did a concert in our hall and wanted to put posters advertising it in the windows but I said no because we didn't want strangers coming in."

Mrs Lidbetter said: "They're dedicated. They perform at schools and youth clubs but it's difficult to get gigs when you're young."

She said the boys were not allowed to start practising before 10am but neighbours had not complained about noise.