Help crazy in laws

Hello thank you in advance for your responses and time. So my in laws are absolutely nuts. To keep it fairly simple and short they are trying to take away mine and my fiances baby for literally no reason. Today they threatened to destroy my property and make our lives hell by burning all our items and taking legal action to get the baby. This is all because we asked that the dog (still a puppy) be trained to not bite any longer. He left puncture wounds in my arm through my fleece hoodie and he thinks it's time to bite when you are clothed or wearing a jacket. Along with this my mil is trying to overmedicate my fiance (21) with depression medication because she believes he is depressed. She makes all his appointments and barges her way into every single one (he had one yesterday and she showed up and convinced them he was a loony) because she thinks he is hearing voices and hallucinating. He asked for her not to come or be in the room. Those were all ignored and the doctor legit saw her and just brought her back and said everything going on with him in the waiting room without consent from him. They wont let us buy anything from the baby and she wants them there all the time. She also is trying to force us to live there and is trying everything under the sun to get us there. The dad cosigned for his car and also wants it out of his name asap because of the dog. He refused to go sign off on it though. His dad also stole over 4000 dollars from him by illegally auctioning off his truck and then when my fiance went to pick up the money they said it was already picked up. His dad stole the money to pay off the debt that was owned to my FIL friend. The truck was fully in my finaces name and he took over 1000 out of the savings account he still had acess to since it was still set up when my finace was a baby. My finace tried to fight it but the bank said there was nothing they could do since his dad had sole control of the savings account withdrawal until he turned 21. So now we have very little money and they are trying to legally take the baby by creating lies and bullshit to prove we are unfit. We both live with my family until we find an apartment in our range to rent and we both have jobs. He is full time and i work part time when i can as I'm a full time college student. We both are healthy people and have working cars (he is gonna tell his dad to shove his car soon at the rate we are going at though but my family offered to help him get an suv). We had a previous baby that they were happy we lost as they would or been a dwarf anyways but they were a mistake anyways. My FIL said all their grandbabies were mistakes so it's not just our children. I'm so lost and worried about all this. Are they really as crazy as I think they are and are they gonna be able to take our baby over this?