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Black Irish Twins 

Siblings born in the same year to different mothers.

A pun on Irish twins, Black Irish, and the multigenerational deterioration of African-American families.

NB: You don't have to be Black to have a Black Irish Twin.
The other eighth graders thought Dion and Errol were kidding about being "brothers from another mother," but they mean it literally since they were Black Irish Twins.
Black Irish Twins by PBMax February 23, 2008

Dirty Irish Twins 

Half-Siblings born within a year of each other, who have only share one parent.
"Trisha and Kristy are Dirty Irish Twins"

"They're both 24, I thought they were just twins."

"Nah, they have the same daddy and two different mama's, Trisha turns 25 this week and Kristy turns 25 next month."