If this is diviorce/custody case, good luck since these things don't go well.
Best advice...documentation, anything and everything. If it's on paper, bring it to court.
I just read the freepmail. If this is a divorce/custody case, be assured that it is common to hear stories about the evil spouse and even Grand Juries proably have heard the same story, different people.
The best thing our freeper friend can do is find a lawyer to represent him/her and see if they can delay the Grand Jury hearing until they can get some additional facts. If he/she can't find someone, then the best thing to do is say as little as possible but tell the absolute truth but I surely would try to find a lawyer for advice!
Hopefully they can find some legal representation. It sounds like a serious problem, so perhaps a legal aid lawyer can help. The lawyer referral service that can be found in the Yellow Pages can arrange an appointment with a qualified lawyer for a minimal amount. That is one option that he/she can still do on Monday.
Jen