This is not a name that I am researching but I did take a look to see if I could find anything to help.You should check out FamilySearch.org I did a search on Morgan Lewis, location-Nova Scotia and found several early records such as the following
Name: Morgin Lewis Gender: Male Baptism/Christening Date: Baptism/Christening Place: Birth Date: 05 Nov 1786 Birthplace: , GRANVILLE TWP, ANNAPOLIS, NOVA SCOTIA Death Date: Name Note: Race: Father's Name: Thomas Lewis Father's Birthplace: Father's Age: Mother's Name: Elezeabeth Mother's Birthplace: Mother's Age: Indexing Project (Batch) Number: C58419-1 System Origin: Canada-VR Source Film Number: 928972 Reference Number: 2:16ST5WS Collection: Canada Births and Baptisms, 1661-1959
Now this Morgan would have been born a generation before the Morgan who married Sarah Sabean- could be his father.I didn't check out every record that was listed-I'll leave that to you.I did also check my copy of Leonard Smiths "Nova Scotia Immigrants to 1867"There are 3 Thomas Lewis mentioned.One am army captain stationed in Chebucto in 1749; one a militia lieutenant in Halifax in 1749 and the third and most likely candidate; a Loyalist from Marblehead Mass.
The familysearch site has a record as follows:
Thomas Lewis Marriage:07 APR 1767Marblehead, Essex, Massachusetts Elizabeth Lemmon (birth About 1747Marblehead,Essex, Massachusets) Children: 1.Mary Polly Lewis Birth:About 1775Of, Freeport, Digby, Nova Scotia
The 1871 Census has two Morgan and Sarah Lewis families; one in Annapolis and one in Digby County.But you probably are already aware of all that.
Name: Morgan Lewis Gender: Male Age: 56 Birth Year: abt 1815 Birth Place: Nova Scotia Marital Status: Married Religion: Baptist Origin: English Province: Nova Scotia District: Digby District Number: 191 Subdistrict: Head of St Mary's Bay Subdistrict Number: h Neighbors: View others on page Household Members: Name Age Morgan Lewis 56 Sarah Lewis 48 George Lewis 19 Anne M Lewis 18 Louisa J Lewis 16 Burton Lewis 12 Sarah I Lewis 10
Name: Morgan Lewis Gender: Male Age: 50 Birth Year: abt 1821 Birth Place: Nova Scotia Marital Status: Married Religion: Baptist Origin: English Province: Nova Scotia District: Annapolis District Number: 190 Subdistrict: Clarence Subdistrict Number: c Neighbors: View others on page Household Members: Name Age Morgan Lewis 50 Sarah J Lewis 45 Handley Lewis 26 Freeman Lewis 24 Colvin Lewis 17 Charles Lewis 12 John Lewis 10 Russell Lewis 8 Hachiel Lewis 5 Lilla Lewis 3