I see what you mean now, and I believe you you're right, I guess it really isn't possible after all. I see how that is, but I'm afraid I may use this wrongly still, because it feels so natural to me to say "My brother Max" when he's my only brother. I mean, I don't think I can trust myself to remember to use the commas in "My brother, Max, performed such and such an action."
Actually, I'm still in doubt even. It's so natural to me to not have to use these commas here that it's difficult for me to sink in. Every time I think I got it right and I understood it now, I start seeing the other option again, namely that you can even say "My brother Max performed such and such an action" (without the commas) if you have just one brother... weird. I'm going to be thinking about this a lot in the coming days, I'm sure
By the way Kevin, I also like extensive usage of commas I don't even think anything of a sentence like "Donald, in my opinion, Patrick, who is an honourable man, should be trusted", I actually like it... still, if I wrote it, I'd be worried that the readers wouldn't like it and probably wouldn't feel comfortable with leaving it like that, unfortunately