DS 1 is 3yrs 3 months, DS2 is 18 months. They continually fight over the same toy - it doesn't matter what one of them is playing with - if they look up and see the other one is playing with anything else (even an old tissue) they have to go and try and take it away. Loud shouts of 'mine' follow, tears and beating each other. I have read "siblings without rivalry" and do try the empathy and negotiation with DS1, but DS2 is far too young to understand. Again, he doesn't understand the toy being taken away either. Any suggestions? I know that some degree of fighting is normal, but as keen as I am to teach them to negotiate and problem solve, I do not want to get embroiled in every little thing (I am just about to drop my third). This is all new territory for both me and DH - I am an only child and he had a big gap between him and his sister, and they never wanted to play together anyway.