@rmadaris, I don’t know how much time you have or anything, but this book could have some helpful tips for you. I really like it plus the content is clean, though I can’t remember if it talks heaps about arranging group shots. Still, I think you’d find it had some helpful tips! 🙂 https://www.amazon.com/Beginners-Guide-Portrait-Photography-ebook/dp/B009375Q32
Plus, there’s this book https://www.neelymarketplace.com/product/30-tips-for-perfect-family-photos/ which I know talks about arranging groups. I have it and it’s really good. 🙂
Hope the photo-shoot goes well!