1940 census: https://familysearch.org/pal:/MM9.1.1/V156-BT3
1930 census: https://familysearch.org/pal:/MM9.1.1/3G45-TT2
1920 census - including your grandfather's name:
https://familysearch.org/pal:/MM9.1.1/MXDY-TWC
death info: https://familysearch.org/pal:/MM9.1.1/JDYB-2KK
death of johnny: https://familysearch.org/pal:/MM9.1.1/J6P4-HQ1
death of robert: https://familysearch.org/pal:/MM9.1.1/JFYQ-66D