How are you going? Not to be discouraging, but this is something that we still struggle with. My DS 2 is 8 months and the age difference is 18 months. We have our good days and our bad days. I find that the behaviour of my eldest is best when we have some quality one on one time at some stage.

That being said, it's very hard to discourage DS1 from the bad behaviour when DS2 smiles broadly at his older brother, even when he's being smacked on the head. DS2 just loves his brother so much.