Lying stepchildren

[Birdskids]

I am finally in a relationship with a man that I love so dearly but we are having problems with his children lying so often we don't know when the truth is actually being told.  Well to be more specific most of the lying comes from the 10 year old girl.  Their mother has them for the weekends and every other holiday and each and every time they come home it takes a few days to get them back to "normal".  
The 10 year old daughter is starting to go through her change and her hormones are coming into full gear.... I completely understand those emotions... it's the lying that I can't take any more.  She has been telling lies that could get her father into trouble.  For example, last summer their mother moved back from Minnesota after being out of their lives for a year (which by the way we didn't have any problems with the children while she was gone), and all of a sudden we where being contacted by social services.  The children's mother took them to social services and the children told the case worker that their father was beating them, locking them out of the house during bad storms, drug use, bruising their legs so bad that they had to wear pants to school to hide them, and that they had to clean up our beer bottles after a big party we had.  What promotes this type of behavior in a 10 and 11 year old?  The four years their father and I have been together never once did any of those things happen.  Now she is telling teachers that nobody loves her except her mother and that we don't feed her at home and when she does eat she never get enough.  I know it's about attention, but why the negative attention? Please help; any input would be greatly appreciated.

[lodzpol]

That is a horrible situation to deal with.  Hoepfeully you will get through it, if it comes down to it, I would like to believe in my heart that the social worker or law guardian will be able to see the differnce in someone who is lying. Also hopefully they will see that you did not have any problems in the past.  Sorry I am not much help, but here to listen if you need.

[jdtm]

Are you sure these things did not happen?  I know an instance when the children were telling the truth - they only lied about the name of the person who committed the acts.  How trustworthy is the mother?  This is the "red flag" that I see.  I hope others might have additional comments.