DD is getting a bit unruly - she's 10 so probably to be expected! DH and I often have to tell her off or talk to her about her behaviour but my interfering DM says we shouldn't both say things to her as it's like we're ganging up on her because there are 2 of us and only 1 of her. I think that's a bit ridiculous but at the same time I don't want her to feel unfairly picked on. How does it work for other people?