My older brother(+8yrs) brews and he got me started. He has brewed for ~6 years and I had brewed with him a hand full of times. When I got a real job and a house where I could brew, I started up. He introduced me to this forum and helped me decide on all my initial equipment.
Since then (~1.5yrs) I I have really gotten into it and have even gotten him to adopt some of my techniques. In some ways the student has become the master. Because he has 6 kids, I have alot more time and less responsibilities than him so I brew alot more often. We collaborate on brews and we talking about ideas and techniques.
It is awesome, and it has really helped us re-connect. With the large age gap between us we had not been that close in the past. We were living apart for so long at college and for work. We are closer now than ever before.
If your brother is interested I suggest you have him over for a brew day and really walk him through every step. If he wants to start that is great, it could be something you could really bond over. Brewing is such a big part of my life and it is nice to share that with my brother. We are so different and don't see eye to eye on much but it has been great for us.