I am feeling very annoyed, but unsure if I should be, or not. As the title describes, my 7yo daughter informed me the other day that she knows about periods. This is what she said happened: She was staying at my husband's adult son's house over night for a sleepover, and his wife (my daughter's adult sister in law) told her all about periods because she "saw her tampons" and asked. Now, don't get me wrong, I don't really mind my daughter knowing what periods are, but I would have preferred to be the one to tell her the details, if that makes sense? I kind of see it as a daugher/mum talk. She hasn't really asked me, because there hasn't been an opportunity - I certainly had planned to talk to her, but I am now feeling very put out that my husband's son's wife decided to tell her all about it without a second thought. I would have preferred it if she had said something like - maybe that's something to talk to mum about? Would you have felt like this too? I haven't said anything to husband's son's wife, but sure felt like saying something. She really annoys me, and this is one more thing to add to the list.