His brother Henderson Luelling (who retained the original spelling of his family's name throughout his life) came to Oregon from Iowa in 1847, bringing fruit trees in his wagon.

[2] He established an orchard in Milwaukie, and Seth and their brother John came to Oregon and joined the business in 1847.

[2][citation needed] The Lewellings played an important role in Oregon's movement for Initiative and Referendum.

[7] In 1892, William S. U'Ren, then a young man, suffered a severe asthma attack, and called upon the Lewellings, who took him into their home and nursed him back to health.

[8] Lewelling suffered a paralyzing stroke on July 1, 1895, and died at his home in Milwaukie on February 21, 1896.