Correct way to punctuate?: My brother Dustin, who is 11 months older than I am, works at a factory.
- My brother Dustin; who is 11 months older than I am; works at a factory.
- My brother Dustin who is 11 months older than I am works at a factory.
- My brother, Dustin, who is 11 months older than I am works at a factory.
- It is correct as is.