Wow another person walking the same path as I...(a little about me 1st - I have 3 children of my own - boy 11, boy 10 & girl 8 1/2 - my fiancee has 2 children - girl 13 & boy 11 1/2 & we just had a baby girl together 6 mos.) My children's father is no longer in their lives (maybe 10% of the time) and my fiancee's mother lives in another state with 3 other children and is in her children's lives about 20% of the time; pretty much we have full custody - everyday all day!
Now with that said, the beginning was easy - his kids yearned for a mother-figure and my kids yearned for a father-figure...it was the rules of the house (mostly his kids) that were harder on everyone...they moved into My/our home from an apt., and they loved the idea of having "their own space" but they didn't understand boundaries or certain rules. Because I had set rules in my house and my kids were younger we needed to adjust them...which called for extensive "family meetings"...the rules were set and adjusted and still are now 2 years later...It will never be easy, but it will definitely have more positive moments for everyone as time goes on...we have rules, punishments, chores, rewards, allowances, wishes, desires, wants and goals, and we all have to agree on how we are going to go about it.
My approach began with letting them understand who I am, where I am come from, what I expect and we can go from there (future aspirations/goals or changes). They did that in return...believe me when I say...its not always a positive thing...I definitely didn't like some of the things they said or did and I know they thought I was crazy for expecting some of the things I was/still expecting (ie. grades - have always been rewarded in my house - you are expected to get good grades - its just something you do - otherwise, get help - tutoring, studying, extra credit, etc. There is no reason what-so-ever to get anything less than a B if you are trying and put your best foot forward, thereby you get rewards. I know it sounds harsh, but my children are all on the honor roll and now after 2 years of adjustments so are my "step-children"). Their father is always in the same "boat" as I am...if we disagree or dislike something we try to all discuss it as a family - unless it really needs to discuss in private. He expects the same from my children. We both work, so we try to have a balance approach on the entire household.
First, none of my children are considered step - it actually irks me when so people refer to my "step-children" as such, because they have delevoped enough of a repoir with me that they call me mom and should be respected as much. We consider each child an individual with a say in the family. Second, no one is above another, regardless of age. Third, we are a family, no matter what the "outside world" says or thinks, we are a family and we will stick by everyone as such. This I found helped in respect for me to them and them towards me, because they knew and saw that I would stand up for them, defend them/ or punish them because I am theirs and vice versa.
My friends and family, as well as my finacee's, help alot, they speak/interact/acknowledge to all of the children as part of a social networking family. Our past Christmas celebration was huge and we solved it by doing a "Secret Santa" - each kid got something on their "wishlist", something that was new to everyone; and it worked out real well.
Ok, so enough about me, I just wanted to give you some of my "real life" experiences. Hopefully, this helps and shows that everyone will have obstacles and its just how we can manage them - right or wrong - then work with them to make it as positive as possible.
As far as you, well the challenge is 1st with you, how do you feel about your "step-children", where do you see yourself with your husband/boyfriend, and are you committed to this for the rest of your life as well as theirs? If the answer is yes, well now all you have to do is move forward and take each experience and treat it as such, understand their is only 2 outcomes (good or bad) and then learn from them and teach them to the entire family! Family Meetings are amazing and will get better as every child gets older, more comfortable and gains knowledge of their "role" in the family. Then you and your husband must decide on how to manage "together" the family dynamics - always make room for adjustments - and work on it - make sure he understands - the responsibility has to be shared no matter what - whether it you take on the leadership in household chores or he takes on the leadership in schoolwork, whatever your strengths are you start with that and split it down the middle - if it seems to be a little lop-sided, then re-shuffle the responsibilities until they are as close to balance as possible. Once this is set implement a plan and discuss it as a family. Your 6 year will start to understand and want to be a part of it. As far as the lying, well I guess that goes for any kid, what you need to do 1st is realize, why they are lying - it is just because they feel that you are not going to be around forever "so, who cares what she thinks?" or is it they feel like if they tell the truth its going to be worse or that they are going to have to walk on "eggshells" until it gets better - once that is determined - go from there to work on the problem, if it calls for a punish or a time out of some sort or taking away an object of theirs until they earn it back - then so be it.
I am not sure why I wrote for so long, but it seems to be something I was compelled to do. I hope I helped you in some way, and didn't seem like it was just all craziness. My prayers are always with you as God is helping you to walk this path, you will find a way to get through it all!
Love and God Bless