I have recently moved house & haven't had any spare keys cut yet, but my mum took it upon herself to get herself a key cut while she was looking after DS2 in my house.
I hadn't realised she had done this until I returned home after collecting DS1 from school on Friday & found my door wide open!
I was a bit shocked at myself, thinking I had walked out of my house leaving the door wide open, when I was sure I locked up, but then my mothers face appeared at the door.
I asked how she got in, and she told me she had got herself a key cut while she was looking after DS2 the week before!
This kind of wound me up a little, but I guess I may it shouldn't do, as I suppose she may have thought she needed a spare key for emergencies.
I just feel she should have maybe asked me first!