how can I teach ds1 to be less selfish without constant nagging?

[losenotloose]

he's eight. if him and ds2 where left to their own devices, ds1 would just keep everything for himself and ds2 would get nothing. it makes me so sad.

at the weekend they get up on their own and watch telly. ds1 has the remote and chooses the programs. ds2 got fed up of this so I explained to ds1 they had to take it in turns. so he will let ds2 choose one program, then it's his turn again. even if he's chosen three programs, ds2 will get one. he has no natural sense of fairness, giving someone else a chance etc. I end up going on at him about it, but it doesn't change and I can see him getting fed up of being told, like he's thinking "here we go again".

what can I do? I end up feeling very negative towards him