After four decades, Grimace's long-lost Irish relative Uncle O'Grimacey is back at McDonald's with the Shamrock Shake just in time for St. Patrick's Day.

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The organization opened its first Ronald McDonald House on Oct. 15. Legend will be performing at the RMHC Global 50th Anniversary Gala in Chicago on Nov. 16.

Singer-songwriter John Legend hosted a 50 Years of Ohana event at the Ronald McDonald House in Hawaii for the nonprofit’s anniversary celebrations.

However, according to a release sent out by McDonald’s, he hails from Grimace Island and has a huge family, that includes his Grandma Winky, aunts Millie and Tillie and his Uncle O'Grimacey.

In a 2001 episode of "The Wacky Adventures of Ronald McDonald," Ronald, Grimace, and their friends travel to Grimace Island, a strange place inhabited by a Grimace tribe of various purple shades.