Cameron Smith

I run forever, With a roaring call. Yet I have no throat, Or any legs at all. Rock wears away, Whilst I grow. You try to race me, And receive a blow. What am I?

Sometimes I am loved, Usually by the young. Other times I am dreaded, Mostly by the old ones. I am hard to remember, Also hard to forget. And yet if you do, You'll make someone upset. I occur every day Everyone has to face me. Even if you don't want it To happen; embrace me. What am I?

A is father of C and D is son of B. E is brother of A. If C is sister of D, how is B related to E?