I'm at the end of my tether with ds. He's 12 and for most of the time he responds to anything I say to him with one of about 4 or 5 phrases, on of which is 'yer mum' and another is 'didn't ask'
It's doing my head in, tbh, and when I ask/tell/order him to fucking stop it, he tells me to calm down 
Please help me 