Final answer:
John identifies Jacob's sons as John and Edward, based on the painting by Joshua Johnson titled 'John Jacob Anderson and Sons, John and Edward'.
Step-by-step explanation:
According to John, Jacob's sons are John and Edward. This can be inferred from a discussion about Joshua Johnson's painting titled 'John Jacob Anderson and Sons, John and Edward'.
Joshua Johnson, who was sold to a new owner and later became a freed apprentice, earned fame for painting multi-figure family groups, which includes the portrait John Jacob Anderson and Sons, John and Edward. This piece is notable for its intricate details such as the silk vest and lace of the children's collars.