(KANSAS CITY, MO)-It's that time of year again, and is heralding the by reviving an iconic character from days of yore.

From Feb. 10 until March 23, 25 cents from each Shamrock Shake purchase will go towards supporting Ronald McDonald House Charity families. The deal honors the charity's 50th anniversary, and "because this moment is all about keeping families together," the restaurant noted, "two beloved members of the family are reuniting for the first time in decades." ... Helping to welcome the Shamrock Shake back to menus are Grimace and his uncle, Uncle O'Grimacey. The reunion sheds light on the peculiar circumstances surrounding the Shamrock Shake's creation, a peculiarly little-known piece of McD's lore.

"This Shamrock Season celebration came to life when Grimace stumbled upon his family's original Shamrock Shake recipe," explained in its statement. "That discovery sparked Grimace to ... reconnect with his vibrant, joyful, and generous uncle, Uncle O'Grimacey."

Fresh from Sham Rock, Ireland, Uncle O'Grimacey is now in America "traveling coast-to-coast, spreading Shamrock cheer with fans everywhere and celebrating RMHC and their mission to keep families together."