Name: Parthena Ford
Home in 1880: Kosciusko, Attala, Mississippi
Age: 50
Estimated birth year: abt 1830
Birthplace: Mississippi
Relation to head-of-household: Other
Father's birthplace: ---
Mother's birthplace: ---
Occupation: Servant
Marital Status: Widowed
Race: Black
Gender: Female

Wade Harvey 28
A.R. Harvey 24
E.A. Harvey 1
Albert Harvey 5
Parthena Ford 50

More than likely her mis-spelled in 1870:

Name: Artheina Ford
Estimated birth year: abt 1830
Age in 1870: 40
Birthplace: Alabama
Home in 1870: Township 14 Range 7, Attala, Mississippi
Family and neighbors: View Results
Race: Black
Gender: Female
Post Office: Kosciusko

Listed in the household of a Thomas Munson - and there is a young married Jane Boyd - 19 and husband Abe in the household. This may be your Jane.

Here is Jane 1880:

Name: Jane Boyd
Home in 1880: Kosciusko, Attala, Mississippi
Age: 24
Estimated birth year: abt 1856
Birthplace: Mississippi
Relation to head-of-household: Wife
Spouse's name: Abe
Father's birthplace: MS
Mother's birthplace: MS

Occupation: Keeping House
Marital Status: Married
Race: Mulatto
Gender: Female
Household Members: Name Age
Abe Boyd 37
Jane Boyd 24
Lillie Boyd 12
Alma Boyd 10
Anzi Boyd 7
Virginia Boyd 4
Luesla Boyd 3
W.H. Boyd 3M

Is the Major Ford you mentioned the one in 1870 listed as:

Name: Major Ford
Estimated birth year: abt 1847
Age in 1870: 23
Birthplace: Mississippi
Home in 1870: Kosciusko, Attala, Mississippi
Family and neighbors: View Results
Race: M
Gender: Male
Value of real estate: View image
Post Office: Kosciusko

with wife Betty

Then in 1880 with another wife and step daughter?:

Name: Major Ford
Home in 1880: Durant, Holmes, Mississippi
Age: 32
Estimated birth year: abt 1848
Birthplace: Alabama
Relation to head-of-household: Head
Spouse's name: Julia
Father's birthplace: AL
Mother's birthplace: AL
Neighbors: View others on page
Occupation: Blacksmith
Marital Status: Married
Race: Mulatto
Gender: Male

Household Members: Name Age
Major Ford 32
Julia Ford 30
Lena Davis 14