Step Families Support Group
Traditionally, a stepfamily is the family one acquires when a parent enters a new marriage, whether the parent was widowed or divorced. This community is focused on many of the relationships and issues that may arise within stepfamilies where you may find answers from some members and you may help other members with their questions.
Don't settle. You are right, what kind of message is your children getting from this. From your description, I wouldn't subject myself to their abuse either. How is the relationship with your fiance? And how long have you known each other? curious......