My approach would be to ask them if they care to share the details of what's going on. If they choose not to, then I respect that.
Since you say that this is not regarding money or any illegal act, then I assume they just need support in redirection of some kind..something they cannot obtain on their own at this time. I'd ask for the basics of why my help is necessary, as I am entitled to know what my help is for. Aside from that, their privacy is their business.
Shangrala