Answer:
Shorter than my four siblings, but easily the strongest, Sometimes I wear a funny hat.
What is a kangaroo’s favorite year?
What has to be broken before you can use it?
When one does not know what it is, then it is somethingÍľ but when one knows what it is, then it is nothing.
What is yours but only used by others?
If it’s information you seek, come and see me. If it’s pairs of letters you need, I have consecutively three. What am I?