We're going to have an extended family holiday, including my single brother, my grandparents, my sister with her children, me and my children. We're going to rent a cottage and I don't know how to suggest splitting the cost. If we divide by the total number, including children, it's a bit hard on those with more children (me!). If we divide among adults, it's very hard on those with no kids. How would you do it? Could we maybe call a child half a person?