DS will be 3 at the end of Jan. His twin sister trained very easily a few weeks ago and is out of nappies. About ten days ago DS decided he wanted to wear pants and use the toilet - he is really really jealous of her having knickers. So he's had pants at home and at nursery but he's making no progress at all. He can withhold his pee but he doesn't know how to let it out into the toilet/potty, so he pees himself a couple of times a day when he's absolutely desperate. It's very obvious when he needs a wee as he starts rocking and squeezing his penis, but he just won't pee into the toilet - has peed a few times a minute or two after going to the toilet. He is very very resistant to going back into nappies and is desperate to wear his pants. He poos about once a day and doesn't volunteer to go to the toilet either but it's easier to catch him starting to poo and sit him on the toilet. We have toilet seats, stools, potties, rewards (toy cars - adores it if he gets one but not motivated to try for one). Any advice? Should I force him back into nappies for a bit? I'm very conscious of the whole thing becoming a negative experience for him but not sure what to do... Thank you!