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A step-sibling of a step-sibling.
Here's an example :
A & B had Child 1
A & B then got divorced, A married C and B married D.
C had Child 2 and D had Child 3 from their previous marriage.
Couple A&C and couple B&D now share childcare responsibilities of Child 1, 2 & 3 and often babysit them together.
So, while none of the three children shares blood, Child 2 & 3 have a common Step-sibling, Child 1.
Child 2 & Child 3 could be called each other's Antipodal Siblings.
"How are you and Jimmy related?"
"Well, we're Antipodal Siblings. Him and I share the same step-sibling, Lucy. Lucy is my step-sister cause her mom married my dad and Jimmy's step-sister cause her dad married his mom. We're one big blended family!"
A step-sibling of a step-sibling.
"So how are you Andrew related to each other?"
"My dad married Mary's mom and Andrew's mom married Mary's dad after Mary's parents got divorced. So mary is my step-sibling and also Andrew's step-sibling. That makes me and Andrew Antipodal Siblings."