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Q) Does this sound like something I could block and successfully win in court? It really seems like this is too broad
Sort of. Keep reading.Deposition
As to the subpoena for you to give a deposition, you COULD try to block that, but it will probably not go anywhere. CW and her attorney (as do RK and his attorney) have a right, within limits, to depose people who may have information that will lead to relevant evidence in the case. Since you have had the opportunity to observe CW & RK over the years and know of her involvement, or lack thereof, with the children, and you may be a witness in the case, they have a right to depose you. You have a right to have counsel with you during the deposition.
Since your interests seem to be more aligned RK's interests, then probably his attorney will provide "cover" for you and will protect you to some degree during the deposition. (That's what I would do, at least.) But, RK's attorney is not YOUR attorney. The only way to guarantee an attorney is on your side is to hire one and have him or her there with you.Subpoena for documents
As for the other subpoena for every communication under the sun, you've hit the nail on the head. The attorney's demand for ALL of your communications are overly broad, burdensome, and the request is vague. CW & RK are now in the discovery stage of the divorce process. They get to (gasp!) discover information about the other side's case. But you are NOT a party to the case; at best you are a third-party witness. This means that the demands the court will allow CW to place on you to produce documents and other stuff is limited.
The motion you or an attorney would file is called a motion to quash a subpoena. The decision of whether or not a subpoena should be quashed, or modified, is an issue within the discretion of the judge
I've attached a sample motion to quash.
This is simply a document I found on the internet and I cannot vouch for its accuracy. I'm just using it as an example; note that it was filed about three years ago, so certain legal requirements for this type of motion could have changed since then. It would be best for you to get legal advice in Illinois from a licensed attorney who can file one on your behalf.
Q) I don't have money for an attorney? If I win, could I get my legal fees covered by CW
Maybe; probably not. The demand for the documents is too broad, but probably not so far out in left field that a judge would grant your motion to quash AND order CW to pay your legal fees. What is more likely to happen is that the judge would simply order CW and her attorney to be more specific as to what they want, and emphasize that they do not have a blank check to get every communication for the past year, as well as a pint of blood from you, too.
Q) How do I go about blocking
You really should get an attorney to represent you and do this for you. If you cannot afford an attorney, perhaps RK's attorney would file a motion on your behalf. Also, perhaps he or she could talk to CW's attorney and see EXACTLY what it is they want. If they can narrow down their requests to something reasonable, perhaps there is middle ground here to compromise.
Be advised, however, that CW's attorney may want to play "hardball" and, in the process, bill his or her client (CW) for zillions of hours in legal fees fighting this motion tooth and nail. I don't want to sound cynical, but that's how the game is played, especially if CW has a hefty income and the ability to pay.
Finally, be aware that if you do NOT respond to the subpoena and you do NOT file a motion to quash the subpoena or to modify it, a judge could find you in contempt, order you to produce the information anyway, and punish you with a fine or other possible consequences. So, act soon.
I hope this helps you. Good luck to you with dealing with these issues.