DS2 has just started biting his big brother. It's becoming a bit of a habit and he's really hurting his brother. DS1 has 3 bite marks on him at the moment

There's a bit of a chain reaction to it all, kids are playing well then it changes in a split second, they have a little arguement and DS2 bites or attempts to bite. DS1 is now learning to get away quick which usually means DS2 will run after him and still try and bite him. It's getting to the point where DS2 is doing it as attention seeking also, he's a bit of an agrovator a lot of the time. The gorgeous cheeky boy he is but i just can't have him bitting his brother like he is and/or another other child (i hope it never comes to that ).

DS1 is 4 and i'm trying very hard to get him to understand not to provoke DS2 and if he is trying to bite him to get away and tell me. When DS2 has bitten i remove him and get him to sit somewhere by himself and tell him it's wrong. But is there any other advice out there on ways to deal with this. My mum says bite him back but i don't think i can do that.

Thanks ladies