I'm confused, didn't Hana said she was the coach sister-in-law?
But now it comes out she's his step-sister? (I'm not complaining about anything, I'm just trying to understand better)
@Ulgan Stepsibling seems correct. They have completely different birth parents but are now siblings through marriage to each other's parents. (His mother to her father). I guess we now have the information to call them stepsiblings.