As others suggested, I wonder if they really are biological brothers … If they are, it is a fun family! You got to wonder if the gay brothers have sex with each other.
The only other gay incest story I am aware of, is the one of the bishop of Bruges, Belgium who admitted to have sex with his brother's son. The fact that the son was a minor at the time it occurred, makes it of course criminal.
https://www.theguardian.com/world/2010/apr/23/belgian-bishop-admits-molesting-boy