when a
woman has a baby with her brother
Kid and Mother's Brother =
Uncle
Kid and Mother's Baby Daddy + Daddy
-------
Uncle Daddy
Timmy's mom is so ugly no
man ever loved her except for her brother, literally.
Mom+Brother=Nephew Son or "
Timmy"
It also can be the otha side around, Auntie Mama. Pretty much the same concept as Uncle Daddy.