I'm a newbie, but based on what I've learned from these ladies, I told the one family who asked for a "sibling" rate that it was $35 per day per spot, and I could not offer a sibling discount. As one person on here said, it's not like the siblings can share food... LOL. I was too diplomatic to point that out, but I did say the cost was per space since I was legally limited to a maximum of 5 and could not just take on another child to make up the difference.