IF Someone has a JTWROS with someone else. If the orginal person passes away Does halacha recognize the transfer?
I assume you are asking regarding yerusha. I don’t see an issue with it, since this is what was agreed upon when they bought it that he only has ownership until he dies.
The only thing is that there shouldn’t be any other issues with it, such that the contract should be valid according to halacha, and if there are Jews involved that there shouldn’t be any loans from one to the other without a heter iska.