From my own experience, skids always get their way in doing things as daddy was too chicken to correct their behavior. If you voiced out their ill manner you will be accused as the bad guy etc etc..you can tell your husband bout his kid and if he truly listens he will take your advice but if its not, you either stay or leave. If you love your dh maybe you can find ways to deal with this problems. You need support with people all around you as being a step parent is really challenging. You cant deal alone.

But if you think you happy with getting a divorce. I say go for it. Everyone deserve to be happy and respected including you. Dont let this kids ruin your live.