My brother has his birthday next week. He's 34. He's also silly. He does a lot of daft things. He drinks too much and gets silly and fools about. His wife likes a drink socially too and can also get giddy. They have a young son. The worst thing he did was filming our mum in his car when she couldn't get up because the back of the seats were so far back and she's got mobility and eyesight problems and is also diabetic. He filmed it and started laughing about it. He put it on Facebook too but it wasn't there for long as his wife made him remove it. When our mum challenged him he just laughed as he thought it was funny. They do bicker quite a bit, her saying he doesn't respect her and he tells her to lighten up. He has his car seats like he is a boy racer.
He has a responsible management job and is well liked at work. On Sunday night I was at their house watching the Olympics closing ceremony and he was trying to get me to have an alcoholic drink or two and calling me mardy. I'm not teetotal but I don't drink much, I had to drive home and my job involves driving too so I rarely drink in the week.
How do I tackle him?