The only Link who has a sister is the one from The Wind Waker/Phantom Hourglass/Spirit Tracks, whose sister is Aryll. Contrary to rumour, Zelda is not Link's sister.
The Link from Spirits Tracks is not the same one from WW/PH. Spirit Tracks happens 100 years after phantom hourglass
Aryll but she only appeared in Wind Waker even though Link from Phantom Hourglass is the Same Link as Wind Waker
Aryll from Wind waker, it is the only game in the series where he has a sibling