Joseph Smith's Uncle Stephen

Source

Biographical Sketches of Joseph Smith the Prophet: And His Progenitors for Many Generations (starts with the Mack family).  

Lucy Mack Smith was the mother of Joseph Smith, Jr.  Lucy's brother, Stephen, settled in Michigan.  The following account was written by another person who knew Stephen Mack and included in Lucy's book:

What Settlers In Michigan May Have Seen

Biographical information about Stephen Mack, who settled in Pontiac:

Source: History Of Oakland County [Michigan]