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2, 6 and 6
The bar is number 14
(2,2,2,3,3 are the composites of 72- the only combinations that add up to the same answer are 2,6,6 and 3,3,8)
As there is a youngest, not the 2 youngest, it has to...

Pour the 4 gallon bucket into the 7gallon 2 times- you have 1 gallon left in the 4 gallon bucket. Empty the 7 gallon bucket back into the lake. Then pour in the remaining 1 gallon in the 4 gallon...

Take a step back and you'll see the ostrich was never in the vase