My sister is living with me.  It is probably the first time in our lives that we have spent consecutive time together.  I remember her as a baby, but not much else.  She looks like her father.  We have the same biological mother.  Our habits are very similar and I wonder why.  we have a tendency to like the same things, the age gap between us is about 15 years, or so I'm guessing.  She has a cheerful booming laughter that rings out consistently.  She is happy.  It's a bonus having a close relative with me, an opportunity to form a stronger bond between us.   I am extremely lucky.