Step-parenting advice/book...

Li

Someone on here recommended a book to help with step parenting and/or step families but I didn’t get the title of the book. Does anyone know of any books that helped them create an environment where a step family can flourish? My SO’s ex is trying very hard to make things difficult with their sons. Telling them I’m “bad” and to stay away from me when there are many times they have to be at home with me alone. I’ve been with their dad since they were born so them being around me is nothing new. I want to keep our family together so that it’s impossible for her to drive a wedge between us.