Brother is considering getting baptised, how to stop? My little bro who's turning 20 has hinted at getting baptised, he already knows my view on the cult so he hasnt said much but my other siblings are full blown jw's and have probably pressured him into doing it.

I know if he does it'll be a terrible life choice, but if I tell him not to he will just rebel more. If I try to show him literature of how wrong this cult is he will just reject it most likely. I think theres truly nothing I can do.. any suggestions :(