Yes, I have it (and was told I was unique when I was younger because girls typically didn't have it). My brother has it (much worse case: severely deep-set eyes, dislocated hips, more pronounced curving of the hands, smaller mouth opening). My father (b: 1940) had it and his father was said to have had it (couldn't get a spoon past his teeth in his old age). Also a first cousin of my father's was reported to have had the bent hands. The ability to "open wide" or extend your hands flat seems to get worse with age.
I've done some DNA comparison with "cousins" on various platforms and in our case it seems to have been inherited on chromosome 17 - which is where our TIPTON ancestry resides.