The 1900 Census for Kennebunkport listed Samuel Jeffery as 54, a farmer, POB: ME, residing with his son, Albert W, age 23, and a boarder, Alexander Friska, Black male age 17, hostler.
A hostler was traditionally a groom or stableman who was employed in a stable to take care of horses.
Bibliography:
1900 US Census for Kennebunkport