First time preteen parent here! We have had a very testing weekend with our DS - he is extremely angry at the moment (doesn't seem to be any reason for it), defiant and so rude - so, the usual preteen joy. But he also seems unable to accept no for an answer; challenges everything we say repeatedly, like a toddler. It's been a horrible few days with endless shouting. Just wondering if anyone has any top tips for dealing with this and if there are any books people can recommend? Thank you!