Diane -- I'm sure your Otto has to be my greatgrandfather's brother.
I noticed he's listed in the 1920 Census in Stratford CT. His father is in the Bridgeport census as Louis with wife Rose and three sons Alex, Louis and Walter.
If you track back to the 1910 census and 1900 census both in CT you will see that Otto is listed as their son.
According to my grandfather's records Louis (born Ludwig) and Rose (born Rosalie Ujak? spelling) had 10 children.
They settled in Duryea, PA where many of their children were born before settling in Bridgeport where Walter the youngest and my greatgrandfather was born.
I'm in the process of looking through some records to see if i can pin-point where they're originally from.
Happy to swap more info with you. let me know if this helps and I'll send you all the details I have.