As far as I know, the Mitchell's and Sacrey's are only related through marriage. My Great grandparents were Enos Mitchell and Isabella Sacrey. Isabella is the daughter of Richard Sacrey and Priscilla Squires. Richard is the son of Thomas and Theresa.
Thomas's parents were Zacharias (sometimes spelled Zachariah) and Elizabeth Sacrey (maiden name unknown).
I don't know who Theresa's parents were.
The info I have says that Zacharias and his 2 brothers, Peter and Stephen, came to the Harbour Grace area in the late 1700's from Channel Islands. But I believe Zacharias' family are the only ones that moved to the area of Pacquet.
I hope this helps some, please let me know if there are any other questions I can help you with.