3 adults and 1 child (age 3) going on holiday. Holiday package will not give clear split of cost. Mother and daughter will share one room. Younger daughter will share with her DC3. Would you just split the cost of the holiday four ways? They have a room each so makes sense to split the accommodation costs equally and the child will also need a seat on the plane but we had thought the child place might have been cheaper than an adult space.
Splitting four ways seems fair however will mean in practice A and B will each pay a quarter of the cost while C will pay half as she is paying for C and D but it is her child.
How would you split the cost?
Is there a better way to do this?