Re: DO YOU KNOW MY GRANDFATHER'S BROTHER?
I did a search for an "unknown Adams" born circa 1890 on the LDS site: https://www.familysearch.org/
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I named Caroline (maiden name unknown) and Daniel Adams as parents.
Several historical records were displayed; however, I don't know where Caroline and Daniel lived, so my search was pointless.
This particular site can show a person's record whose parents' names match on a marriage, death, or even birth record.
You may wish to try to search for him on that site.