There are 18 sets of twins in my family from my Grandparents to my Great-Great Grandparents. All are on my mother's side (I don't know my father) and they are on both my Grandmother and Grandfathers, with direct links to me.
There are 5 sets of twins in my husband's family but they are a fair way back in the direct lineage (My MIL and I have been doing our family trees).
There were no twins in my generation of children, nor in my mother's (direct to me) generation of children (so none of my siblings/cousins or my mother's siblings). My Mum has twin cousins.
Most of the twins are girl-boy twins and I am unsure if the same gender twins were identical or not.
My sister has 4 children (5 pregnancies) no twins. My brother has 3 children - no twins. I am pregnant with my second (6 weeks). I too am wondering what are the chances this one is a twin?