False case against father in law n husband sec 354,

Dear all, please inform if a wife has filed a complaint against his father in law for ipc 354, for s*xually harassment,, and because of which his husband is also in custody of the same section. 354, I need to in which way case can be withdrawn from court, by husband wife. And what are the consequences when withdrawing case. And can the case be withdrawn ?, please inform in detail. Husband has the photos msgs, of wife, n her boyfriend , this is actual reason, but wife denying it, and saying they are just frnds, husband is genuine person, no points against him, because of which she is accusing father in law, so that she can get divorce. Please provide good advice.