I beg to differ. Their case is not complex at all. There's no family immigration visa category for a nephew, and even the best immigration attorney isn't going to be able to create one. The other common non-immigrant options have already been pointed out, as well as the likelihood of getting any of those visas and the disadvantages of each. The only things that haven't been pointed out are those that have very little chance of success, such as a refugee/asylum application or a private relief bill filed by a US Senator or Congressman.
There's no harm in the OP consulting with an immigration attorney, but they shouldn't get the impression that this is something that an immigration attorney can fix (even a very good immigration attorney), and there are many attorneys who would be happy to promise them the moon and stars while separating them from all of their savings, and in the end deliver nothing.
Charles C reacted to JimVaPhuong in Suggestions for Getting Nephew of Finacee to US