Simplify the following text for a Grade 7 native English-speaking person.
Original: U.S. Navy surgeon Benjamin Franklin Bache ( 1801 â `` 1881 ) and the physicist Alexander Dallas Bache ( 1806 â `` 1867 ) were grandsons of Richard Bache Sr. ( and thus great-grandsons of Benjamin Franklin ) .
Simplified: Another son was Benjamin Franklin Bache ( 1769-1798 ) .