Should I move in with her?!

My best friend and I are both 30yr old. I’ve been married for 11 years and we have three kids. She is single with four kids. She lives down the street from her dad who has always helped her with her kids. She has a GREAT job but the schedule varies every day so he gets her school age kids off the bus every day and they move rather fluidly between her house and his. She recently found out that her dad is molesting her oldest daughter and she’s obviously cut ties with him and he has no more contact with her kids. That being said tho, she no longer has much help with her kids. I am a SAHM and my husband also has a great job. Between the two of them they make about $140k/yr. We’ve started to entertain the idea of getting a 5 bedroom rental for both of our families to live in together. My husband and I would have a room, she would have her own room, and the 7 kids would easily be split up by sex and age. It’s like it almost works out perfectly. I love her children. It’s not uncommon for me to have them a week at a time and she have my kids all weekend long. We’ve been been besties since we were 12. We lived together as teens with no problems. Her and my husband get along just fine and I do NOT question either one of their loyalty or faithfulness. I’m only worried about going from a family of 5 to a family of 10 practically overnight. Worried about having 10 people live together peacefully. I’m so conflicted. She NEEDS me.