We're planning to rent a huge beach house for a week this summer with a bunch of friends. The proposed $$ split doesn't seem right to me, but, I'm not sure what a better way is.

How would you break down the rental costs for a 7 bedroom, 5 bath house?

It'll be a total of 10 adults, 1 teen, 2 kids, 2 babies.

Family 1 - couple with kid and baby, sharing room & adjoining bath
Family 2 - couple with kid, sharing room & adjoining bath
Family 3 - couple with baby, sharing room & adjoining bath
Single adult 1 - own room, will use one of the two common space baths
Single adult 2 - own room, will use one of the two common space baths
Single adult siblings 3 & 4 - sharing room, will use one of the two common space baths
Teen family member - own room, will use one of two common space baths