I've been getting conflicting information on this problem. If I write:
"My brother Sam loves to eat cake." OR
"My brother, Sam, loves to eat cake."
OR to be REALLY clear "One of my brothers, Sam, loves to eat cake."
Do I leave out the comma around his name in the first one to indicate that I have other brothers other than Sam? If so, I don't understand this because he is my ONLY brother that is "Sam" whether or not I have other brothers, and why should me having other brothers be of interest to anyone anyway?
Does the second one indicate he is my only brother by being written with the commas?
Or should I just use the last one, which would sound odd if I was writing this to someone who is aware of Sam and that I have other brothers already.