My Edmonds tree goes back to 1713, and that includes following all branches downwards as far as possible, and to the best of my memory there are NO sets of twins in it at all (until you get down to my cousins children, but my cousin married a twin). Quite unusual i should think.
When I had my children and was asked at the hospital if there were twins in the family I confidently said 'no' !
However, since working on my husband's DeBoo tree, I find lots of sets of twins! 2 of his grandfather's brothers were twins, though his dad never knew that till we found the births. Then several in the previous generation.
Just thankful I didnt know this when I was pregnant!