I used to do motorbike trials, i was terrible to be honest, i didn't have the weight or energy required for it, i would have loved to carry on with it but at the time i used my mums partners land, and they split up so that didn't work out.
I used to have an old 'fantic' 125 and i hated it with a passion. i then bought a 'gasgas' 125 and loved it. but my favourite bike i had was a home-made one it was a really old touring bike completely stripped down with a wooden seat and a massive petrol tank, i don't think i liked it so much because it was good, more because i had spent time helping to make it.
your brother is very good at it , don't let him quit! it would be a shame.
this is by far my favourite motorbike trials video : ....trials....