I have posted similar before.
DSD(8) lives with us. Before me DH was a young single parent so MIL helped him a lot. As a result I have been more lenient with her blatant disregard for our family life.
We also have a 9 week old DS.
These things seem small, but she often lets herself into my house. She makes a beeline for DSDs room ( often with a brief you don't mind do you?... Over her shoulder), cleans it up, collects her laundry, makes her bed.
DSD went to stay for a few days over hols. Decided she didn't like a belt on some trousers. MIL "oh DSD says she doesn't like belt, so I have kept it." Why? Why not send it home and let me deal with it??
She 'popped' round today, asked me if she could take the children's washing home. Was visibly surprised and annoyed when I said I'd done it. Just to point up here - I'm not the type to have mountains of laundry piling up, she will literally leap on a few pairs of pants.
She also said "by the way, I'd you know the baby has a drs app on tues? I saw the note in your nappy bag. Who does she think made it????!!!
I may be sleep deprived over sensitive but this is lik, every other day. She is overstepping the mark isn't she??
It is constant. I feel that she thinks I am incapable, which I'm not.
Oh and we have lived together for 4 years now so I'm hardly new on the scene!