NC for this as other posts are identifying and I think DP's ex reads this.
Dp and I live quite close to his ex and children. They officially live with their mum but stay here between 2 and 5 days a week depending on schedules. We have spare keys to each other's houses for emergencies.
I was ill on Friday so didn't go to work. As I was lying in bed i heard the door open and dp's ex walked in! She had taken the children to school and was stashing their scooters at ours so she could collect them on the way home. Apparently she does this everyday when they use the scooters! I was so surprised and not feeling well so wanted to go back to sleep so I just mumbled ok but I'm actually pretty annoyed. It's not that the scooters being there is a problem but I feel a bit invaded. I would never dream of letting myself into her home for my own convenience. I have only used her key twice when she had locked herself out and called me to ask for help.
I have spoken to dp who agrees its cheeky but doesn't really mind.
I'm not sure whether or not to raise this - we generally have a good relationship which I think is best for the children which I don't want to ruin. On the other hand being confronted with your partners ex in your own home when you're ill isn't nice and she does have form for taking the piss a bit (for example she used to ask me to cancel my plans at short notice while dp was working late so I could babysit so she could go to the pub and didn't want to take no for an answer - I don't mind helping out but I'm not about to cancel my plans to do so in a non-emergency situation.)
If you were in this situation would you say anything or grin and bear it for the sake of keeping things sweet.