Meditation, which takes a longer route to the psychedelic states, can also help and has less stigma attached to it. Something to consider at least.
By its very nature, the practice (such as Vipassana) involves not becoming attached to rising stimulus, on a moment-to-moment basis. I can tell you from personal experience, someone who is habituated to be sensitive like your brother, will have a difficult time with this. Further, there's nothing you can do to make your brother do this practice.
The thing about well-guided mushroom and Ayahuasca experiences is such that you learn what it is like to not be sensitive to arising stimuli, and as such, seek out practices like this. (Though there are other things going on too). If you are serious about looking into using psychedelics for therapy (possibly when your brother is older), it may be something to do together rather than throwing your brother out into the void.
By its very nature, the practice (such as Vipassana) involves not becoming attached to rising stimulus, on a moment-to-moment basis. I can tell you from personal experience, someone who is habituated to be sensitive like your brother, will have a difficult time with this. Further, there's nothing you can do to make your brother do this practice.
The thing about well-guided mushroom and Ayahuasca experiences is such that you learn what it is like to not be sensitive to arising stimuli, and as such, seek out practices like this. (Though there are other things going on too). If you are serious about looking into using psychedelics for therapy (possibly when your brother is older), it may be something to do together rather than throwing your brother out into the void.