WHG II is Gates's father, so his grandfather would have the same name, and the date would be fine. I can't find much info on WHG I, but it seems like maybe he

WHG II is Gates's father, so his grandfather would have the same name, and the date would be fine. I can't find much info on WHG I, but it seems like maybe he was a banker, which would make it surprising if he was writing about mice.