What are the chances of my son's father being made to have SUPERVISED visitation.?

my son's father is a pathalogical liar and uses his children as pawns in his chess game of...getting attention from women, lying, cheating, etc. he's has a serious selfish problem. he and i were together for six years and in those six years he subjected his children to at least 2 other women and their kids. Now he's attempting to subject my son to his "new" girlfriend who he met in AA. she's a pediatric nurse mother of three and a Narcotics Addict. the last girl he cheated on me with thought he lived alone and had this little old dog, for a year he lied to her and continuously took his three kids (one of them, my 3 yr old son) over to her house. While in wal-mart one day, his oldest son, Jamesy asked him, "Daddy, why do you lie to lizzy about where we are going? Daddy why do you live with lizzy when you are seeing Dawn" he told jamesy, "i promise james, i'll quit cheating on lizzy" at the same time he was buying flowers and asked jamesy to give them to dawn so it looked less romantic and cuter. she bought it. she and i met when he finally checked into detox. Alcohol is just one outlet of his manic ways. he's up right now and living in vegas "acting" like he's a changed man. But he's left two voicemails in the last week and i can tell he has been drinking again. he's now got his new girlfriend haring me over texts. i want him to have "supervised" visitation if any at all. right now his eldest son is in counseling at school. he's 9. he has panic attacks over his dad. he loves his daddy but his daddy has asked him to lie and keep quiet about where they go etc. he's tells a good lie. i'm afraid the mediator will give him unsupervised visitation when he comes to visit from vegas. we're in illinois. what are the chances that i can prove he subjects his children to immoral situations. what do i have to do to get my ducks in a row to prove his judgement is impaired. do i need statements from past women, his ex-wife, his eldest son's school counselor? right now it just looks like we're all angry women. but i'm trying to protect my child from being hurt like his eldest brother is hurting. HELP.