I still don’t understand why the writer for the ROTJ novelization decided making Owen Obi-Wan’s brother was a good idea. Luke calls Owen “uncle”, so unless Obi-Wan was intended to be Luke’s other uncle (which isn’t likely), it doesn’t really make sense.
I would have preferred Owen to be Anakin’s literal brother, but the canonical explanation of him being Anakin’s step-brother is fine too.