S.L.
I don't have any advise although something you said troubled me. You wrote "I stay home but I strongly believe in teaching my kids to be clean and hard working. My 5 year old keeps her room clean and helps maintain the house in order. Heck my 2 year old dropped her milk a few days ago at breakfast and she went and got a kitchen towel and cleaned it up. I didn't have to tell her anything." Are you saying since I don't stay at home that I can't teach my son to be clean and hard work? I learned this by staying home by myself. My mother worked and so did my grandfather,(my father left my mother before I was born) I wanted to feel independent growing up,I did chores without asking, I learned proper manners, although I am no finishing school student, I said "yes ma'am" and please". Now as a mother myself, even though I would love to stay home with my son, financially I can't. But as my son grows up we will instill the manners and things we grew up learning.
Your stepdaughter is just going through a phase, my cousin married into an instant family too. Her stepson wanted to go somewhere she wouldn't drive him and he went after her with a knife. That was the signal to go to counceling. Now he is 28 and has kids of his own, still talks to her everything seemed fine after councelling.