My 12 year old DD is a lovely girl, intelligent, affectionate, generally a nice person to be around. But some aspects of her behaviour bother me. I don't know if these are normal or indicate some underlying issue. Firstly, she tells fibs. Sometimes it's little things like she has borrowed my mobile phone without asking, other times it's big things like the sofa cover being torn or things being broken. She will look you in the eyes and say "it wasn't me" even when you know 100% it was. She takes things from my room without asking which I will later find, often broken. She also takes things from her sisters room without asking and often they get broken too, but she will fib about it. Tonight I noticed some wallpaper on the chimney breast in the lounge had been torn - she was the only one in the room this afternoon and it wasn't like it earlier so I KNOW it was her but she completely denies it. I have talked to her about lying and trust but it seems to make no difference. She displays other forms of "sneaky" behaviour, like sneaking food up to her room and then hiding the wrappers, which I have also talked to her about - generally if she wants a snack I let her have it so I don't see why she needs to hide it. She is also very disprespectful of belongings - I bought her some new clothes recently and before she had even worn them I found them scrunched up in a ball in the drawer, I regularly find clean clothes in the laundry basket and dirty clothes like knickers pushed under the bed or shoved anyhow into a drawer. I have threatened to confiscate the new clothes next time she does this. And I guess this is normal, but so annoying is that she leaves a trail of destruction after herself - she had a bath tonight, left the water in the bath, towel on the floor, dirty clothes on the floor, shampoo, soap, tooth brush etc just left. Repeat this for every room she spends time in, there is just this constant trail of mess. How can I teach her to take more responsbility without constantly nagging her all the time (which it feels like I do at the moment). And how can I encourage her to be more truthful with me? I had real fights with my own Mum about my room etc growing up so don't want it to become a bone of contention. Thanks.