Appears he married a 'Mary Hannah' - name of mother on Roberts marriage?. You can find more on this familiy by plugging the names/dates etc in the free search tool at https://familysearch.org/
World War I Draft Registration
Citing this Record "United States, World War I Draft Registration Cards, 1917-1918," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/K6V6-XWM
Todd Elliott
Residence: 425 Linden Ave., Johnstown
Draft Registration date Sept 12, 1918
place: Johnstown City no 1, Pennsylvania, United States
Male White
birth date: 07 Sep 1881 US
Employment National Radiotor Co. , Johnstown, PA
Nearest Relative: Mary Elliot, 425 Linden Ave. , Johnstown, PA
nara publication title: World War I Selective Service System Draft Registration Cards
nara publication number: M1509
film number: 1893243
digital folder number: 005267049
image number: 04541
U S Census, 1910 Johnstown Ward 17, Cambria, PA
Citing this Record "United States Census, 1910," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MGZS-TQ3
self Todd Elliot M 29y PA
wife Mary Elliot F 29y PA
dau Grace Elliot F 5y PA
dau Julia Elliot F 3y PA
son Robert Elliot M 1y 3m PA
U S Census, 1920 Cambria, PA
Citing this Record"United States Census, 1920," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MFBN-562
self Todd Elliott M 38y PA
wife Mary C Elliott F 39y PA
dau Grace Elliott F 14y PA
dau Julia Elliott F 12y PA
son Robert T Elliott M 10y PA
U S Census, 1930 Johnstown, Cambria, PA
Citing this Record "United States Census, 1930," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XH8L-MT6
head Todd Elliott M 48 PA
wife Mary C Elliott F 50 PA
dau Grace T Elliott F 24 PA
son Robert T Elliott M 21 PA
Pennsylvania, County Marriages, 1885 – 1950
Citing this Record "Pennsylvania, County Marriages, 1885 - 1950," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KH6T-Y47
Robert Todd Elliott
Marriage 22 Jun 1937 Allegheny, PA
age: 28 est birth 1909
father: Todd Elliott mother: Mary Hannah
spouse: Eleanore Jane Mcclimans
age: 26 est birth 1911
father: Hugh B Mcclimans mother: Wilhelminia Fisher
World War II Draft Registration
Citing this Record
"United States, World War II Draft Registration Cards, 1942," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/VQFV-SP8
Todd Elliott
Residence 801 Linden Ave, Johnstown, Cambria, PA
Draft Registration
date: April 27, 1942 Johnstown, Cambria, PA
Male White
birth 07 Sep 1881 Pittsburgh, PA
Nearest Relative Grace T Elliot, 801 Linden Avenue.
Employer: National Radiotor Co., Johnstown, PA
nara publication title: World War II Draft Cards (4th Registration) for the State of Pennsylvania
nara publication number: M1951
arc identifier: 563728
film number: 2240131
digital folder number: 004128449
image number: 01733