See if you can bond him out. If not, get a lawyer to file an immediate bond motion and state the reasons to the judge why the FTA was not willful.
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It sounds like your family member likely has already been to first appearance which is an opportunity to explain to the court that he was present. However, many judges add a "do not adjust" phrase to their warrants which will require you to go back before the judge that issued it. If that is the case and you can't otherwise bond him out, hire an attorney to work fast to file a bond motion stating all you just mentioned. If he's charged with a new charge of Failure to Appear, there would have to be proof that he willfully did so otherwise, the charge can't stand. With this being first charges, most judges are understanding enough to give an opportunity for release but without knowing more, it would be hard to determine.