[header] How to defend against a psychological family violence claim [title] Keep records of all communications. [step] Avoid speaking to someone who's accused you of psychological or emotional abuse unless those conversations can be recorded in some way. [substeps] When you do have to interact with them, do it over email or text message whenever possible so you can maintain a record of the conversation. 
Keeping records of conversations keeps the person from claiming you said something that you didn't say. Keep conversations cordial and business-like, and try to stick to the topic rather than discussing emotionally fraught issues in which your words could be twisted.