I find last name spelled ABBOTT in doing research on the family. It is ABBETT on Milton's headstone.

NEWARK.
Mrs. Milt Abbott, who has been an invalid for several years, passed away Friday morning. Rev. King conducted the funeral services Sunday morning at the home of the deceased after which she was laid to rest in the cemetery. The devoted mother and wife has gone to an eternal home where suffering and pain is no more. We extend our heartfelt sympathy to the bereaved family.
Edina Democrat, Edina, Missouri, February 08, 1907, Page 8, Column 3
and
in Newark News Items in The La Belle Star, La Belle, Missouri, 08 Feb 1907, Fri • Page 7, Column 4

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1870 United States Federal Census
Name: Mary Abbott
Age in 1870: 22
Birth Year: abt 1848
Birthplace: Kentucky
Home in 1870: Fabius, Knox, Missouri
Post Office: Newark
Household Members: Name Age
Milton Abbott 26
Mary Abbott 22
John Abbott 4
Mittie D Abbott 1

1880 United States Federal Census
Name: M . I . Abbott
Age: 34
Birth Year: abt 1846
Birthplace: Kentucky
Home in 1880: Salem, Lewis, Missouri
Race: White
Gender: Female
Relation to Head of House: Wife
Marital Status: Married
Spouse's Name: M. D. Abbott
Father's Birthplace: Virginia
Mother's Birthplace: Kentucky
Occupation: Keeping House
Household Members: Name Age
M. D. Abbott 36
M. I. Abbott 34
J. T Abbott 13
M. D. Abbott 11
C. S. Abbott 7
William Abbott 5
Joseph Abbott 3
Milton Abbott 6m

1900 United States Federal Census
Name: Mary Abbott
Age: 55
Birth Date: May 1845
Birthplace: Kentucky
Home in 1900: Fabius, Knox, Missouri
Relation to Head of House: Wife
Marital Status: Married
Spouse's Name: Milton D Abbott
Marriage Year: 1866
Years Married: 34
Father's Birthplace: Virginia
Mother's Birthplace: Kentucky
Mother: number of living children: 7
Mother: How many children: 7
Household Members: Name Age
Milton D Abbott 56
Mary Abbott 55
Milton B Abbott 19
Emmett Abbott 16
Leslie Aerhart 15