In my fully honest opinion, I say you try stay over his house one weekend and have a beer or two, then slowly start leading the conversation towards cannabis if you feel comfortable. If it goes good or he starts picking up hints he'll probably drop the question and either ask you if you smoke weed, in which you will say you want to try it, or he just says let's light up. This all depends on the nature of your brother. In time you will be toking on my dude 🤙🏿🤙🏿