Query for rcr

Hello ,

My wife has filed divroced 13(1)(1a) Mental Crualety after 2 years of sepration , I am now planing to file RCR Sec(9) , will it be beneficial?How can i bring stay on her petition?Can i convert her divorce petition into RCR Petition?What are advantages and disadvantages to file RCR after her divorce petition?Which case will run first??