Frank married Ella J. Poyser (daughter of John Reed Poyser and Mary Mellen). They had no children.

Source: "Joseph Poyser and his Descendants 1763-1983" by Josephine Lois Poyser Fullerton pg 13
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
He married a second time to Myrtle F. Montgomery, daughter of Mr. and Mrs. James Montgomery. They had six daughters:

Eve Lelia (b. Aug 1894 in Indiana)
Ruby H. (b. 1902 in Indiana)
Violet
Wanda
Eleanor
Captola

Frank and Myrtle are buried together.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~`
"United States Census, 1900," Frank L Alexander, ED 8 Clinton Township, Boone, Indiana, United States

name: Frank L Alexander
titles & terms:
event: Census
event date: 1900
event place: ED 8 Clinton Township, Boone, Indiana, United States
birth date: Nov 1868
birthplace: Indiana
relationship to head of household: Head
father's birthplace: Indiana
mother's birthplace: Ohio
race or color (standardized): White
gender: Male
marital status: Married
years married: 7
estimated marriage year: 1893
mother how many children:
number living children:
immigration year:
page: 4
sheet letter: B
family number: 94
reference number: 95
film number: 1240360
digital folder number: 004118582
image number: 00815

Household Gender Age Birthplace
head Frank L Alexander M 32 Indiana
wife Myrtle F Alexander F 25 Indiana
daughter Eve L Alexander F 6 Indiana

Source Citation
"United States Census, 1900," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MMBD-MXN : accessed 18 July 2012), Frank L Alexander, ED 8 Clinton Township, Boone, Indiana, United States.
~~~~~~~~~~~~~~~~~~~~~~~~
"United States Census, 1910," Frank L Alexander, Clinton, Boone, Indiana

name: Frank L Alexander
birthplace: Indiana
relationship to head of household: Self
residence: Clinton, Boone, Indiana
marital status: Married
race : White
gender: Male
immigration year:
father's birthplace: Indiana
mother's birthplace: Ohio
family number: 164
page number: 10

Household Gender Age Birthplace
self Frank L Alexander M 41y Indiana
wife Myrtle F Alexander F 35y Indiana
dau Lelia E Alexander F 15y Indiana
dau Ruby H Alexander F 8y Indiana
dau Violet Alexander F 4y Indiana
dau Wanda Alexander F 2y Indiana
Fath-in-law James R Montgomery M 67y Indiana

Source Citation
"United States Census, 1910," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MKGM-5FL : accessed 18 July 2012), Frank L Alexander, Clinton, Boone, Indiana.
~~~~~~~~~~~~~~~~~~~~~~~~~
"United States Census, 1920," Frank Alexander, , , Indiana

name: Frank Alexander
residence: , , Indiana
estimated birth year: 1868
age: 52
birthplace: Indiana
relationship to head of household: Self
gender: Male
race: White
marital status: Married
father's birthplace: Indiana
mother's birthplace: Indiana
film number: 1820427
digital folder number: 4300602
image number: 00635
sheet number: 4

Household Gender Age Birthplace
self Frank Alexander M 52y Indiana
wife Myrtis Alexander F 45y Indiana
dau Ruby Alexander F 18y Indiana
dau Violet Alexander F 14y Indiana
dau Wanda Alexander F 11y Indiana
dau Eleanor Alexander F 7y Indiana
dau Captola Alexander F 4y Indiana
Father-in-Law James A. Montgomery M 77y Indiana

Source Citation
"United States Census, 1920," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MFQY-8S4 : accessed 18 July 2012), Frank Alexander, , , Indiana.