Mediation

There is a mediation being held for the parents who has 3 children in foster care the beginning of February. The SW is looking at me as a possible resource to adopt the 3 children. I've asked if I could visit the children again (it was a new SW so permission had to be given again) and it was granted. At the time of permission, SW said if I could attend the upcoming mediation that would be great. I can attend the mediation even though I'm 3 states away. The parents do not know of my involvement yet and when I attend this mediation they will learn about me. What should I expect in mediation? What will be expected of me while I'm there possibly? Any tips on how to handle my cousin and his wife? Or any tips over all on mediation would be helpful. The SW is completing ICPC from my understanding. I was told this from the first SW but it didn't get done, but the current SW admitted that to me so I'm trusting her to tell me the truth. She is really hoping for me to get a homestudy done soon with trial for TPR set in March. Thanks.