L.H.
I have a 6 year old step son and needed some similar advice when my husband and I got married. Its such a difficult adjustment. I read the book "The Single Girl's Guide to Marrying a Man, His Kids, and His Ex-Wife: Becoming A Stepmother With Humor And Grace" by Sally Bjornsen. I swear this book saved my life. Its funny and gives great advice. I made my husband read it, too, and it helped him to better understand where I was coming from. You can find it on Amazon.com. Read it! You won't regret it! Good luck.