past domestic denies fiance and kids to visit prisoner Prison, Jail

Recently my fiance and the father of my children was sentence to 30yrs. In iowa prison. I filled out my visiting application week after he arrived at the classification center and sent it in; heard nothing and still haven't on if I was denied until he omail ed me 2 days ago saying his counselor at the prison he was transfered to stated that due to a domestic between us that happened 5 yrs. Ago denies any form of communication between him, our kids and myself. We had been living together ever since this domestic was closed, along w communication up until the other day. He asked if the kids could visit w his mom; they are denied as they are victims also. My question is how can I appeal this? Even if it excludes me how can I get it to where our kids can visit their dad w their grandma? I have been having a lot of issues w our oldest since his dad's incarceration and a visit was what he was looking forward to. Thanks