Must I appear if I have been subpoenaed in a divorce case?

Question Details:

I'm an ex-girlfriend in a divorce case. A deposition subpoena was brought to my house; I wasn't home so my mother signed for it. Do I have to show up for this? I live in KY but the divorce case/deposition is in TN. Shamefully, I had an affair with the man for several years during the marriage, even after the wife filed for divorce. I was not the reason for the wife filing for divorce; she know nothing about me until after she filed. What impact could my deposition have on this divorce case? Can I refuse to do the deposition? Important Notice