It could be about drugs because when you're coming down ecstasy your hands sometimes get shaky.. 'Your brother' could be a metaphor for drugs i.e. 'Don't be such a slave to your brother', and 'Waiting for a trick from your brother' i.e. waiting for the effects to kick in.
It could be about drugs because when you're coming down ecstasy your hands sometimes get shaky.. 'Your brother' could be a metaphor for drugs i.e. 'Don't be such a slave to your brother', and 'Waiting for a trick from your brother' i.e. waiting for the effects to kick in.