When I use my stern voice, my DS, 2.9, often just laughs at me. I don't over-use it, I don't think. If I use a very shouty voice, I get tears as a response! Ideally I'd like to get somewhere in between. I see other mums with their DCs who take notice when the stern tone is used. Has anyone dealt with this highly irritating response?! How do I get him to take me seriously without unwittingly scaring him with angry mummy??