Only people who are not actually related to you are referred to this way.
It can also only be used as a direct statement to someone, you can't refer to people like "he's my brolander" or anything like that, and if you do, you're a savage.
Brolando comes from the word BRO and ORLANDO. It is based off the fact that orlando is the wakeskate wakeboard capital of the world. So most of the people hin ornaldo are "DUDEBROS" which is also defined.