OK she's not my SIL, she's my DB's girlfriend, he's only been with her a year and I've met her a few times, she's been out with the kids with him and been to my house a few times and played with the DC's etc. Today they popped round and have just gone and she and DD (6) played a game upstairs while me and DB chatted downstairs, which consisted of her and DD tying up DS (9) and spraying perfume on him. She played a similar game last time she came round and now that she's played it twice, it has suddenly struck me as being something quite unusual.
I should mention that she's very young (my DB is a decade younger than me) and she's Russian, doesn't speak much English so it could be a cultural thing or whatever, but I just feel a bit uncomfortable about it because it's the sort of game I'd expect ghastly little girls to play, not a little girl aided and abetted by an adult.
Is my discomfort unnecessary? I'm so aware of toxic behaviour from all my mad relatives atm, that perhaps I'm seeing it where it isn't...