I have read several posts about this, but no one has answered a question I have been thinking about. We have a party of 11. I know the tip will be added in, but how?
My family of 5 is on one card (DDP), my sister's group of 4 on one card, and then my parents, 2, on their card.
Will we be lumped together as a group and the 18% be on the group total? OR will each of us be charged 18% on just our family total?

My family of 5 is on one card (DDP), my sister's group of 4 on one card, and then my parents, 2, on their card.
Will we be lumped together as a group and the 18% be on the group total? OR will each of us be charged 18% on just our family total?
