Ds2 is 3 years and 4 months old. He shows absolutely no interest whatsoever in toilet training. He refuses to wear undies (even though I have gone out and bought him his own special Thomas undies). He simply rips them off. he sees his older brother going to the toilet, and when I say to him 'do you want to do wees on the toilet like a big boy?' he just yells out 'no! no! no!'. i have tried bribing him by saying that i will buy him a Rosie engine when he does it but nothing is working on him. Where should i start with this? Leave it till summer? Be more forceful? i just don't know what to do.