'Grethan' is the ship name for the YouTube twins Ethan and Grayson Dolan. Fans ship them either as a bromance or romance, the most popular and accepted one being the former.
I ship Grethan, I think they'd be a cute couple.

Ew, why do you ship Grethan, they're brothers!
by grethan98 December 25, 2017
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Grethan is a ship that should be more widely accepted though it is incest based.
"how could someone ship Grethan? They're brothers!"

"it doesn't matter, they're cute!"
by dolannnnnnnn May 17, 2018
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A very weird ship between two Twin brothers Ethan and Grayson Dolan. Their fans made this up to spark some type of bromance between the two.
1.Omg I ship grethan
2. Eww there brothers

1.I don’t ship them like that I think they have a great bromance
by Reetyeetfacts January 18, 2019
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. The name is sometimes used as a bromance ship name/an actual romance ship name. The ship name of the world's most hottest twin YouTubers Aka Ethan Dolan and Grayson Dolan
Oh my gosh! I TOTALLY ship Grethan.
Eww...why would you do that? They're brothers
by rita ;) October 11, 2018
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