First off, the doctor who told you to be afraid of children's services needs to be replaced. they clearly are well meaning but totally do NOT understand what they are dealing with, in my opinion. telling you that if you turn to cps then you will be charged is just ludicrous. CPS, or whatever your area calls child protection, MUST be called. It is BEST if you do it or if you go to your daughter's pediatrician (if you trust the pediatrician) and tell them that son has been attempting to abuse your baby. Then the pediatrician MUST report, but will say that parents are doing ALL they can and came for help. This will influence cps to be on YOUR side.
How do I know? been there done that. This was teh route we took for our son's first psychiatric hospital stay (4 mos). Most places won't keep a child that long, but he needed it. We needed it because he was not safe at home. He couldn't not hurt us.
I am very afraid for you and your family, esp daughter. Your son shows very serious, scary things. Whomever told you a judge wouldn't get involved is an idiot or has lost their marbles somewhere. Setting a fire and burning a house down is a felony. Killing animals on purpose is also a criminal act. trying to sexually abuse his little sister is a criminal act. there is NO WAY that this should not be in front of a judge. NOT NOT NOT to punish your stepson, but to keep your family and the rest of society safe while your son gets the help he needs. If you try to send the boy to his mother, your husband is going to end up in a TON of legal trouble because he KNOWs that the biomom's boyfriend or someone abused his son. Your husband CANNOT send your son into a situation where he knows abuse woudl happen. now the courts can order visitation and then your husband MUST send him, but with supervised visitation there just isn't a way to send the kid to his mom's to live. The courts and cps will eat y'all alive for trying that one, regardless of what the doctor/therapist/whatever says. I know it is messed up that the court can make husband do it, but husband can't do it because it is unsafe for difficult child. Never will I claim that courts make sense on this, it just is waht it is.
You need a WRITTEN safety plan. who does what, where, when, how when son is being unsafe. List the ways he has been unsafe and what to do for each situation. Put it up on the wall where it can be seen in several places. this will be a big help with CPS.
From this moment on, no matter what, the kids are NEVER unsupervised. If you and husband are not both home, you take the same sex child into the bathroom. They can be on the other side of the shower curtain, but they cannot be alone. This is because abuse can happen in seconds and cause damage for a lifetime. I do know how tough this is.. I know that longing to just be able to pee in private and not be able to because you know it puts your kids in danger. but it IS necessary.
I honestly don't know if your son can be helped. I know how awful that sounds. he has hit some of the MAJOR markers for serious antisocial behavior/sociopathy. This is probably from a combination of abuse and genetics, but we don't really know enough about that. Right now your job is to keep everyone safe and find help. It may be that your difficult child won't be able to safely live with the family. it does happen. Long ago one mom coined the term 'family of different addresses' after she and her husband had to put their son into a residential setting. They adopted twins not knowing how horribly they had been abused and how hurt they were and how hard it is to help them heal. even now, when her children are within a couple of years of being adults the difficult children are not able to be together safely. It is very hard. It is a thankless job, parenting kids who have been so hurt.
Whatever happens, you MUST make safety the priority. Put locks on EVERYTHING. If your cabinets have exposed hinges, replace them with ones taht are on the inside of the door and put a lock on the outside. NEVER let your keys be out of your sight. Attach them to your body at all times. It is a PITA. It is NOT the way a home should be. It is necessary to keep everyone SAFE.
the calling that DDD suggested - do it. I once filled 2 legal pads, every line, 2 columns per page, with records of calls from one place to another to find help for my son. I cried a LOT the week I made those calls. I didn't hide how upset I was when I spoke to people. I ended up with a couple of OPTIONS. help we didn't have before.
As for a residential setting amking him worse, he is going to get worse anyway. The thing you have to focus on is keeping your innocent baby safe from him. You can't keep her safe if he kills you in your sleep or a fit of rage. It could happen. He has already almost killed himself burning down a house. It doesn't get more real or more dangerous than this.
I HATE sounding so negative. I will offer some hope. You have an amazing support system here. We have info, we have walked in your shoes, we know you are not exaggerating and this is not "typical kid stuff". We are here anytime and we won't run away or stop talking to you just because it is too much. We also don't really sugarcoat things. we try to be polite, tactful and considerate, but we also tell it like it is from our point of view. We also know that not every suggestion is right for every family, so if you don't take our advice, we don't get offended or angry.
I can tell you that from age 7 or to age 15 or 16, I honestly thought the BEST we could hope for with my incredibly gifted Wiz was staying out of prison. Now? He is 20, has a 4.0 in college, and is a great big bro and son. He has had the same job for several years, one he found himself. he has worked 2 jobs at times, by choice, and he has a good group of friends. I can honestly say that NONE of us have a clue how or why things changed, not even Wiz. But he truly regrets and he most positively DID NOT regret anything back when it was all so awful.
Please, don't let your daughter EVER be alone as long as he lives with you. even at night put an alarm on her door and on your own so that if teh door opens you will be alerted. You cannot lock him into his room at night, but you can put an alarm on it to let you know if it opens.