Brother in law wants to kill husband?

Okay, so this is pretty long so bare with me. I’ve been with my husband for three years now and married since September. Both of his parents passed away by the time he was 21. (He’s now 27 in June) he has little brother that just turned 18 and a grandma that is dependent on others as well. When I met my husband his little brother (15 at the time) and his grandma were living with him and he was providing for them. He’s been taking care of both of them since he was 21 years old and lot his mom. There are two other brothers (half brothers) that are older and are complete shit bags. They wouldn’t help take care of either the little brother or grandma so it’s always fallen on my husband which of course he’s a good person so it was never a question he figured out how to make it work and how to be able to financially and emotionally support both of them. Well, the grandma (she’s honestly crazy) left without even telling him one day to go live with the other brother. The brother couldn’t deal with her living with him because like I said this lady is crazy and basically a hoarder so he put this lady in A CAMPER. incredibly wrong in my opinion but what are you going to do. Anyways, so the little brother is still living with us (July will be 5 years since he’s been with his brother so since he was 13). I’ve always thought he was a little weird. I thought that maybe he was slightly on the autism spectrum. We’ve talked to his school and worked with him but nobody at the school or anywhere believes he has a problem. He’s straight up weird though and I don’t mean it in a nasty way. He is completely antisocial, has no feeling, a pathological liar, obsessed with games and killing games and all of that. He can’t hold a ‘normal’ conversation or have the social skills to see other people don’t want to talk about that. Can’t read body language or any of that. When the grandma also lived with us they would both talk so much crap about my husband. Just mean nasty things. But, they’re family and he felt like it was his responsibility to his parents to take care of them so he always ignored it because he felt like the right thing to do was support them. So I started looking stuff up and this kid is like definition sociopath. So I talk to my husband about it and he doesn’t want to believe it but he does agree there’s definitely something off.. well fast forward to yesterday. We’re getting ready to buy a house and the little brother is staying with my mom right now since it’s basically summer with all of this corona stuff and he can do his school online. So, we start to pack up his room. I found an old school notebook and put it in the trash pile. For some weird reason my husband happened to flip through it. Well on the last page it has “KILL (insert husbands name)” written over and over again. It was written probably 20 times. So he called me over and told me to look at it and I’m just sitting there like....😳 so after that we decided that it was fair game to go through his stuff when that wasn’t our initial intention. So I found where he wrote letters to him just talking CRAZY STUFF YALL! Calling him an ‘evil seed’ just crazy shit. Which, I’m not biased when I say this because everyone in his life will tell you that my husband is the most selfless, giving man you will ever meet. I mean he was 21 years old and took in his grandma and little brother with no questions asked when nobody else would even think about it and he’s been caring for him for 5 years now. This kid gets everything he wants he has PS4, Xbox, phone, a laptop. The only thing we ask of him is to occasionally mow the lawn, the dishes at night if there are any and you take the trash to the road. Anything he wants he gets it, so I don’t understand. So I went through his phone because it’s at our house because he had gotten it taken away before going to my moms house (lying about school grades) and he’s in group chats on instagram and his ‘friends’ are making nasty memes about his brother (my husband) and indirect memes about doing bad things at school. Completely crazy stuff. We’re 25 weeks pregnant. So, I’ve been telling my husband for a couple of months that I just have a really weird feeling about his brother and I really don’t want him around my baby. So now, he completely agrees with me and I guess he’ll be staying with his grandma until we can figure out something better for his living situation. Yall, I’m just like 😳 I don’t even know what to think. Am I being dramatic? Is it wrong that I want my husband to have no contact with his brothers and I don’t feel safe to have my baby around honestly any of them but especially the little brother? Idk can I get y’alls thoughts/opinions something?

Update: y’all the issue is that yes he just turned 18 in February and he’s an ‘adult’ but he’s a junior in high school a senior when school starts back up. He has no health insurance because my husband never legally adopted him because he took him in when he was young when he took him in and that takes money that he just never had until recently. The kid doesn’t even have a ‘government ID’ only a school ID. His birth certificate and SS have gotten lost and it’s damn near impossible to get that right now. So basically it’s going to be 4-5 steps to even get him an ID. Get a certified copy of birth certificate, then SS card THEN go and try and get a state ID. He doesn’t have a permit or drivers license any of that because we never felt like he showed us he was capable to safely drive.

He absolutely can not live with us while getting help and facilities cost money and I’m not sure he would even agree to it. So, unfortunately in my head the best option is to just get him away from us and to let him figure it out on his own. I mean we’ve done everything for him and I get it it’s crappy that he lost both of his parents and he’s basically an orphan but he’s never been the slightest bit grateful towards his brother. He’s never said thank you, he doesn’t even know his birthday!! So I’m just to the point where I feel so bad for my husband and he’s just been so disrespectful that I just want him OUT and AWAY from us and our soon to be here little girl. Is that wrong?🙃

Also, a few months ago way before we ever found this stuff my husband very bluntly asked him “would you ever kill me?” Because like I said, we’ve had this feeling that there’s something wrong with him for a while and he does some pretty erratic stuff. His answer was “well, I don’t want to go to jail so no”. Not “you’re my brother and sometimes I get upset with you but of course not. Or no I love you” nothing like that.