Wow! They really do have granite peppering in their sides, but their neck patterns don't follow the normal granite markers in item 2 in this list:
http://www.ball-pythons.net/forums/s...ad.php?t=49621
Mom may have something special going on - I'd hang on to some of the girls and raise them up and breed them to their brother to see what's going on - even breed the boy back to mom!
Congrats!