Lying 8 year old step daughter

[Dawnrida]

My partner of 2 years has a now 8 year old girl who is a right little brat. I've too set the rules bit am undermined by her father. We only have her every 2nd weekend and even that's to often for my liking. She was with is full time at the beginning of our relationship because her mother would take off preventing my partner from being able to go to work so I moved them both into my place.  4 months I did everything for this kid as well as my own then she went back to her mother full time and since then all hell jas broken loose. She wouldn't sleep on her own with lights or TV off, the last thing I say b4 going to bed is everything is off get up during the Nighy no he's. Left. TV abd lights on. I've set rules about washing changing clothes etc no she doesn't listen now she has started telling lies about thongs that are happening to her at her mums which half turns out to be lies but of course being a Dad's only child he can't see what she's doing wrong. She is a constant liar and o just don't believe anything she says now.  I actually called authorities last week because her stories were so convincing oh would I have looked like and idiot. I've 2 children of my own ages 12 & 17 and they absolutely hate it when she's here especially my younger 1. Im actually worries about having her here with her stories in case she comes up with some crap of my son doing something to her. I'm at the stage where if I organize anything such as going away etc I make it for the weekend she's not with us or anything to do with my own family I yell her father hr needs to swap weekends with her mother as I'm not prepared to take her anywhere at my expense until such time is she starts showing me some respect. Yes I took her and her dad on but not to be treated like crap by her. Her mother is a useless compulsive liar who tries but fails to come between my partner and I to the extent that the child came a month ago telling me daddy came to.my house during the week this turned out to be yet another lie. I have spoken to her several times about lies and the conso quenches but she still.continues. any other r suggestions.  Her father constantly says it's not her fault she knows the difference between truth and lies.

[Dawnrida]

Before you go any further for the sake of the child's well being I've been in contact with authorities ok. I have issues with the child because we have spoken manu many times about telling lies and she knows the dif between lies and truth. I've tried and tried with this child and everytime I do I get crap from her mother. I spend my every 2nd  weekend dealing with that child's hair aa it's riddled in lice all the time. Now tell me if I didn't have feelings why would I bother doing this.  Why would I bother allowing her into my home to see her dad when I could say he's to take her else where.  And do I not have feelings as well hem she chooses to tell lies about my partner going to her house when he hasn't. No I don't have feelings.  I gave up 20 houts a week to care for this child does that not also tell you something.  

[Dawnrida]

Easier said than done right. Dad just needs to face the fact hid daughter and her mother are the ones causing the problems and that the child needs to be removed from her mother's care before she's completely ruined.  I use to have a lot more d time for this child...

[AnnieBrooke]

You're blaming a child, who has a child's emotional capacity for not handling a situation that many adults (starting with the three main adults around her) cannot handle well.  It's not the child who is causing the problem.  I'm not seeing you have any sympathy, your anger at the mother is also turned into anger at the child (and the dad).  If you cannot bring yourself to simply end things, please at least see a counselor to talk it all out and perhaps release some of the tendency to blame a kid for not being an emotionally mature adult who is accepting and showing forbearance and turning the other cheek, in a situation that hurts her all the time.  

[AnnieBrooke]

End the relationship with the man, sweetheart.  You are blaming a kid for having a natural reaction to a chaotic and anxious life.  Sorry.  You can't get over your anger at or dislike for the child, it's not going to work with the dad.  Cut your losses, end it, and begin dating someone without children.