Taking in BILs baby- super nervous.

Okay so this is a bit of a long one.. but I'm sooo nervous and had nowhere else to post. Not even sure if this is the right group 😬

My husband and I are going to be adopting his older brother's newborn son. His brother is a drug addict, and has been for years and has been physically abusive in the past. He will not get clean. He's been to multiple rehabs, we tried to house and help him in the past too but he stole my pain medicine and then tried to SELL IT BACK TO ME 🤦‍♀️ (I was on gabapentin 1800mg/daily for fibromyalgia and would have seizures if I stopped cold turkey, he knew this). So we kicked him out and we ended up moving out of state a few months later. Fast forward, his girlfriend called us and told us she's pregnant and doesn't know what to do. Husbands brother won't get clean, and actually physically harmed this poor girl while she was pregnant (she is ok). She has 2 sons already, one of which has severe health issues and is constantly in the hospital/ needing surgery and needs a ton of care. She has also begun to go blind during her pregnancy and they don't know why, among other health issues. She's now considered legally blind and got her license revoked. She is going to be induced early in a few weeks because they are worried about her and baby surviving the rest of this pregnancy. She was going to give him up for adoption but was afraid of him ending up in the system or having a bad home so she asked if we would take him. She basically just said she can't provide him a good life, doesn't have the space or time due to her sick son and she feels like he'd be better off with us. Husband's brother doesn't really care what happens to his son- he has said so.. so we discussed it and agreed- this is our nephew and we couldn't bear to see him go into the system/end up somewhere bad. We are calling a lawyer tomorrow to figure out how to do all this legally. We will 100% give her any access to her son she wants, she's a sweet girl and honestly my heart breaks for her making such a hard choice but I admire her strength doing what she feels is best. However I am 25 weeks 2 days pregnant & due early February with our first baby. We have plenty of space currently and we are actually moving into a 3 bedroom house next May once the house is renovated.. a handful of people have given us some baby stuff already and we will get plenty more from our virtual baby shower. Whatever else we don't get we can buy. We recently got into a much better financial position so we know we can provide for them both. But I am terrified. I stay at home and my husband works 6 days a week. I know he will help when he's here and his parents said they'd help too. They will also take him while I am in hospital during labor/after our girl is born. I just want to provide the best life I can for these babies and be the best mom I can be even tho this is all new to me. I was mentally prepared for our daughter but taking in our nephew has been a surprise. though I'm sure he will be just as much a blessing ❤ We found out today his first and middle initials are AJ (Alijah James) and our daughters is AJL (Anais Joy Lynn) neither of us knew the others name choices til today. ❤❤

Are there any books or classes or resources that helped any of you as a new parent? If you read this novel, thank you!