Beginning Potty Training

I've been generally leaving the when of potty training up to John since he will probably end up with the brunt of potty training.  He's home with them every day, and plus they're all boys and Mummy doesn't have those parts.  We have one pretty basic straight forward potty seat.  We pulled it out today in hopes that the boys may be interested in it and to try to get them used to it before we really dive into potty training.  Well interested in it they were.  They fought big time over who got to sit on the potty seat.  They yelled, pushed, shoved, and cried big tears about who was sitting on the potty seat.  I have never seen them fight like that, it was definitely not the reaction we were expecting.  Apparently we are going to have to get a second potty seat sooner rather than later, because sharing one just is not going to work.  At least they are showing interest in it though.