Cinders, I live in St. Catharines too! I personally do not offer sibling discounts. I charge my full time rate for both kids. I have siblings in my daycare and they both pay the full amount for their spots. I do not think your price is unreasonable for this area (I wish more people in the Niagara Region had prices in this range), and you should just tell parents you don't offer discounts as you are only allowed so many children.