Easy Riddles

Lucy had it first, Ethel had it last, Mary Lungel had it twice until she married Peter Stern and never had it again. What was it?

I have a brother. However much we run, we do not reach each other. What am I?

There is one in every corner and two in every room. What am I?

I am as simple as a circle, worthless as a leader but when I follow a group, their strength increases tenfold. By myself I’m practically nothing. What am I?

I can only be played on a windy day. What am I?