Never married, for many years Susan made her home with her sister and brother-in-law, Henrietta and John Wertz.  It must have been a satisfactory arrangement because Susan continued to live with John after Henrietta's death in 1914.  Over a span of 30 years they lived in at least five different locations.

John died March 31, 1937, and was buried at Ottumwa Cemetery, Ottumwa, Wapello County, Iowa.  His brother, Henry, was buried in the same plot in 1946.  We are left to wonder when and where Susan died and was buried.

Henry Martin, 37, male, farmer, value of personal estate 250, born OH
Marie, 3_ [poorly formed digit, probably 33], born KY, could not read or write
Susan, 3, female, born IL
Eliza C, 1, female, born IL

Martin, Mariah, 44, female, white, keep house, value of personal estate 100, born KY [no indication of literacy]
Susan, 13, female, white, born IL, attended school within the year
Eliza J, 12, female, white, born IL, attended school within the year
Sarah, 9, female, white, born IL, attended school within the year
Harriette, 6, female, white, born IL, attended school within the year
Roberts, B H, 37, male, white, farmer, value of real estate 3000, value of personal estate 500, born KY, male citizen of the U.S. aged 21 or more

Fisher, John, white, male, 47, married, farmer, born PA, both parents born PA
Diantha, white, female, 39, wife, married, keeping house, born MI, both parents born VA
Willie, white, male, 15, son, single, helps on farm, attended school within the year, born IL, father born PA, mother born MI
Frak J, white, male, 14, son, single, at school, attended school within the year, born IL, father born PA, mother born MI
James, white, male, 10, son, single, at school, attended school within the year, born IL, father born PA, mother born MI
Charles, white, male, 8, son, single, at school, attended school within the year, born IL, father born PA, mother born MI
Mary, white, female, 5, daughter, single, attended school within the year, born IL, father born PA, mother born MI
Martha J, white, female, 1, daughter, single, born IL, father born PA, mother born MI
Fisher, Josiah, white, male, 31, brother, single, works on farm, born IL, both parents born PA
Cora, white, female, 7, niece, single, born IL, both parents born IL
Martin, Susan, white, female, 22, servant, single, servant, born IL, both parents born KY

Wertz, John R, head, white, male, Aug [year overwritten, looks most like 1844], 45, married for 13 years, born IA, father born PA, mother born IL, blacksmith, months not employed - 0, could read, write and speak English, paying on a mortgage on his farm home, farm schedule 137

Henryetta, wife, white, female, Mar 1864, 36, married for 13 years, mother of 0 children, born IL, both parents born KY, could read, write and speak English

Martin, Susan E, sister-in-law, white, female, June [year heavily overwitten, 18?7], 42, single, born IL, both parents born KY, could read, write and speak English

Wertz, John R, head, male, white, 55, married (3rd) for 22 years, born IA, father born German - Germany, mother born [no entry - or too faint to read], born English, blacksmith, own ship, working on own account, whether out of work on April 15, 1910 - no, number of weeks out of work during 1909 - 0, could read and write, rented his home

Henrietta, wife, female, white, 46, married (1st) for 22 years, born IL, father born IN, mother born KY, spoke English, could read and write

Martin, Susan, sister-in-law, female, white, 52, single, born IL, father born IN, mother born KY, spoke English, could read and write

Wertz, J R, head, renter, male, white, 60, widower, could read and write, born IA; father born Germany, native tongue German; mother born IL, spoke English, blacksmith, own shop, working on own account

Martin, Susan, sister-in-law, female, white, 62, single, could read and write, born IL, father born IL, mother born KY, spoke English

Family #131
Wertz, C C, head, owner, home value 600, did not own a radio, male, white, 66, widower, age at first marriage - 35, could read and write, born IA, father born PA, mother born IL, spoke English, salesman, hand lotion, whether a veteran of the U.S. military or naval forces mobilized for any war or expedition - [no entry]

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Family #132
Wertz, J R, head, owner or renter - no, value of home or monthly rental - no, did not own a radio, male, white, 75, widower, age at first marriage - 20, could read and write, born IA, father born PA, mother born IL, spoke English, occupation - none, whether a veteran of the U.S. military or naval forces mobilized for any war or expedition - no

Martin, Susan A, sister-in-law, female, white, 72, single, could read and write, born IL, both parents born IL, spoke English