I'm not sure what other taxes you're concerned with, but a transfer of your brother's interest without consideration almost certainly would be eligible for a total exemption from the real estate transfer tax.
No way to opine intelligently about that without having any relevant facts.
In the abstract, virtually anything is possible, but that would be extremely unlikely.
Although you didn't say so expressly, I assume you're contemplating divorce (otherwise, this thread would be awfully weird). If you or your wife files for divorce, given how short your marriage has been, you'd be foolish to take the case to trial. Most divorce cases settle by way of a marital settlement agreement, and courts virtually never refuse to adopt a mutually agreed settlement agreement (again, especially so in the case of a very short marriage). The outcomes about which you're concerned would only be possible if you mutually agreed or one of you refused to settle and forced a trial (again, extremely foolish).

