Need to know cabin category and age of child to give you the points.
For example,
Cat 11 cabin (least expensive), 1st two people in cabin are 227 each
For Cat 9 -11:
3rd/4th Adults (13 and up) in same cabin as 1st 2 people are 189 each
3rd/4th Child (6 - 12) in same cabin as 1st 2 people are 159 each
3rd/4th Child (3 - 5) in same cabin as 1st 2 people are 156 each
Best wishes -