Just focus on the marriage, the family, and don't let your wife draw you into any arguments...
If she's spreading lies just tell anyone who asks...
"I am dissapointed that she would stoop to immaturity to deal with problems in a marriage... I feel sorry that our son has to be exposed to her behaviour... I hope she realizes what kind of damage she's doing very soon..."
Something like that... AVOID getting sucked into the drama.. get it dignified and focussed on family
