So...your children’s last names are MAGNUSSEN or something like that? Because if they are a direct line paternally, they should in theory have the same last name as Carolus Magnus...assuming no one in their family tree changed their name.
Or maybe not. I don’t really know where or when it became customary for children to inherit their fathers’ last names.
No, not Magnussen. Alderman. One of my fifth cousins provided this information.