My great-grandmother's, sister's grands and great-grands had the traits for those extra fingers. They all either fell off, or were surgically removed. I know of maybe 8 of them that I can think of off the top of my head in that sector of the family that were born with them.
ETA: Hey CT4...does it mean there was some inbreeding going on? LMAO
But no, it was like the great-grandmother (my nana's sister), the grandmother, 3 of her 8 children and about 4 of the grands that I can think of. My cousin Donnie (who is a great-grand) has two daughters and they both were born with it. I never thought it was strange since I had so many cousins like that. It's wierd to see that statistics show only 2 of 1000.