The third missing great uncle is Charles/Chaim  Brownstein, son of Abraham and Minnie/Mindel. I have his passenger manifest from 1896, and he is in the 1900, 1905, 1910, 1915 and possibly (?)1930 censuses. I can't find him in 1920 or 1925. I can't find a death certificate or WW1 draft card. Any suggestions or help would be appreciated. 
Here is 1900

Here is 1905 

Here is 1910

Here is 1915

It is possible that he is in the 1930 census, wrongly identified as Joseph. There was no Joseph in the family, and the birth year of 1886 is close. On the other hand, the census taker was clearly confused, as he or she listed both an Abraham Jr. and Sr. and there was no junior, as you might imagine. 

Here is 1930


Anyway, any help or suggestions would be greatly appreciated. 
Todah and a sheynem dank, 

Howard Brown