Brother and Sisters

As a child amongst the four of us kids and as we got older and now have children of our own we have always referred to each other by saying Brother or Sister.  We can't remember who started it our how it started, but in the last couple years people have stopped and asked us did you just say Brother or Sister!!!! Never crossed our mind that it was weird or different since it came so natural to us.  Funny as it may seem I started calling my kids Brother and Sister and I hear my older sis and my niece use this phrase all the time now!!!!  I started it with my kids out in public for security reasons and it has stuck!!!!!  sometimes it's a lot easier to yell out Brother or Sister when one of the kids is being disciplined than to yell out the other child's name...... if your a mom you would understand!!!!!