family court

So while I was sick over the weekend when it was really bad I stayed at my ex's brothers fiance (Amanda). I'm friends with her and they have their own house. Well of course on Friday Justin (my ex) decided to come over and "help" take care of me and the baby... he passed out on the couch. So Amanda came home early from work and helped. On Saturday he came over and didn't help with the baby at all, Amanda and I did everything. Justin played video games with his brother upstairs for probably 10 hours. Last night I get a call from him but of course wouldn't answer (I never answer his calls because I hope he leaves a voicemail that I can somehow use in court). Well of course he must know I save the vmails because he left the most bullshitting voicemail I have EVER heard. Saying he misses and loves me and Graig (the baby) and that it's his "personality" to take care of people and that kids love him and he wants to be in Graig's life and have that bond that only a father and son can have. He just went on and on. I couldn't help but to laugh!! He has NEVER taken care of me. The last time I was puking for 13 hours straight when we were together he went out and got wasted during the day and didn't get home until 11pm and by then I went home! He makes everyone take care of him. And to even IMAGINE him alone with my son could give me a heart attack. He is incapable of caring for a child for even a day. Every time Graig cries or whines he gets SO pissed and rolls his eyes or walks away and mumbles something under his breath. I just don't get why he lies and pretends he wants something to do with Graig. And why all of a sudden when he's almost 8 months old?! I asked him if he wanted to see a mediator instead of us going to family court but he said he wants Graig 1 day a week and 1 weekend a month. I won't have that, so I'm prepared to go to court and show pictures of him strangling my cat (He sent me a text while I was pregnant of him strangling my cat with the caption "You're not home where are you?!"), pictures of him smoking weed he had online at one point, pictures of him and his girlfriend smoking weed, and I have a letter I gotta pull up saying he hates me and wants to die and just him mentally abusing me on paper pretty much. He is a very abusive person... both mentally and physically. I'm terrified he will get some sort of custody. I'll be fine with supervised visitation but I can't have him be alone with my child.. EVER. And I want to ask for a court ordered drug test to prove he does drugs. I want a hair one though from him because when he got his 1st DWI he was ordered to go to a rehab program and he used a wizanator or w/e to cheat his drug tests. Now he's gotten another DWI and possession charge and head butted a state trooper. If you google his name "Justin Gingras" articles come up. I don't know what to do! Please give all the advice possible, thank you! We have court exactly a week from today at 11am.