I have read with interests the posts here. For the record I am not a step-parent nor do I ever plan to be one. I still believe that the day my son was born I abdicated my right to be selfish about my own happiness. Does this mean that I've given up on being happy? No! I simply find my happiness in serving others and stepping mentally and physically away from my own selfish needs. There have been times when I wanted to divorce my husband because he's a self-centered work-a-holic. In fact the distance between us has become so great that we haven't had sex in 3 years. I see a counselor weekly and work on how to find my own happiness where I am not where I want to be. My son is the most important person in my life. My only job is to produce a well adjusted functional person capable of living a happy healthy life. Once that is accomplished perhaps 15 to 18 years from now then I will divorce and move on. My husband and I never fight in front of my son, we do all the things families do - but mom and dad sleep with their backs to each other which is something our son doesn't see. 
 
What I don't get is people who are not married (living together) who consider themselves step parents. Whether you are a man or a woman makes no difference. To the kids you are not a step parent. You are just the person who has sex with mom or dad. If you are not married even if you plan to be you should not take any disciplinary role with these children. In fact it would be healthier for the kids if you left the house when the kids came to spend time with their bio-parent. After you are married is different of course.  
 
Do I believe that step parents are the only ones to blame here? Absolutely not. Many bioparents contribute to the problem by involving their kids in they're own desperate attempts to hold on to what's gone. Also to the person whose fiance has been accused of molesting his boy. What action has this man taken to prove these allegations wrong? He should be going to CPS and telling them what is going on. There will be an investigation of course but if there is no validity he will be cleared. Furthermore the bio-mom can be prosecuted for making a false claim. It will be very ugly but in the end if your fiance is innocent the truth will out. The investigation would be very stressful and you might even have to live a part for a while but wouldn't it be worth it to have this settled. A competent forensic nurse and child psychologist who works with abused children could get the truth in one or two sessions. If your fiance thinks this will go away he's wrong - he should stand up like the man you say he is and for his child's sake initiate an investigation. 
 
Also to the person who drugs her step children - I think that's awful - you want these children to develop healthy coping skills - but you are teaching them the unhealthy coping skill of all. Plus this tactic suggests that your coping skills are far from adult and healthy. 
 
Gotta Go