William Hudson was naturalized as a US citizen on February 28, 1857. He immigrated from Baildon, Yorkshire, England in September 1848 with his family. He was the second husband of Margaret Cooper Ellison, and the step-father to Benjamin Walker Ellison and his older sister Mary Maria Ellison (married three times: Dawson, Martin, Robinson). Margaret and William had at least three children together: Anna, Emma, and Elizabeth. I can find records only that Anna survived to adulthood. She married Enoch Robinson (as did her half-sister Mary).
The Naturalization Act of 1855 made for the situation that all of William’s children born outside of the USA (Mary Maria, Benjamin, and Anna were born in Baildon, Yorkshire, England) and his alien immigrant wife became US citizens upon his naturalization.
William was a good step-father as evidenced by the fact that Benjamin went by the last name of Hudson for quite some time as a young man, and he named his second son William. He did not name any of his sons after his birth father, Walker Ellison. Benjamin learned the trade of being a maltster from William: the grew the ingredients for beer and brewed the beer. William Hudson died in 1860, one year after Margaret, at the age of 45, leaving the children orphaned.
The original record (with little information on it):
And the card: