Answer:
A beggar's brother went out to sea and drowned. But the man who drowned had no brother. Who was the beggar to the man who drowned?
The sharp slim blade, that cuts the wind.
In the night a mountain, in the morning a meadow.
Weight in my belly, Trees on my back, I travel fast in my place, but feet is a feature I lack
It's in your hand though you can not feel it. Only you and time can reveal it.
People take me on walks and I run and have fun. What am I?