There are listed as Pit Bulls by the vet and the human society. Both were rescued as puppies. The male weighs in around 108lbs. The female (black and white) is only about a year old and hasn't filled out yet. They are both big playful babies.
Ah-ha.
They're American Bulldogs....:)
Have a look here;
http://www.bulldogbreeds.com/americanbulldog/photos.html
Notice the dramatic difference in height between "pit" Bulls and American Bulldogs.
http://www.bulldogbreeds.com/americanbulldog/photos.html
Your son got himself some special pups....:)