Hi Alice,
We offer a sibling discount to students who reside in the same house at any stage of the week. This includes half siblings, step siblings, foster siblings and guardianship situations (usually familial). We recognise that family units are very different these days and want to acknowledge that to our families. We have a different way of setting up the discounts for these situations as sometimes the billing account differs.
I hope this helps.
Miriam Williams
(Nowra Anglican College)