I regularly look after my niece (dbs daughter), who is almost 12. I've noticed on several occasions, on leaving my house she'll have pocketed several of my 4yo dds colourful pens or something similar, and it'll usually fall out of her pocket before she leaves, or I'll notice it bulging in her pocket and pull her up on it at the time. I'm probably not as sternly as i should be, i guess because i'm so surprised it's happened and what she's taking is usually not very valuable. I do now watch her though and that's not great.
Tonight i was at her place and dd had been in her bed watching something on the ipad while dn was doing homework, and the ipad was left in the bed at dinnertime. Before leaving their house, i was by her bedroom (off the lounge, it's a bungalow) and i saw her notice the ipad and quickly cover it with her blankets. I then asked dd loudly where the ipad was, and dn ran into her room and got it. I'm pretty sure that if i had have forgotten it, she was intending to use it and keep it without telling me.
I didn't pull her up on it though. Which now i'm regretting.
For context, she and her younger db live primarily with her dad (my db) and they see her very emotionally unstable mother every second weekend. The split has not been amicable and i know that her dm says awful things about her dad and our family (which is against the court order to denigrate the other party). I don't know if this normal behaviour for her age, possibly related to the issues with her mum, or just bad behaviour that needs to be dealt with in its own right.
Should i raise my concerns with my db, her dad, and if so how do i do this sensitively? Or should i talk to her on her own about stealing and it's potential ramifications? She's otherwise very responsible, mature and a lovely girl who i trust, no behavioural issues at school. I think she's just a bit sneaky, and maybe she's acting on it now.
Interested to hear your experiences, ideas on how to deal with it etc please!