Family #49 in the 1798 Grimm census.
Family #110 and #290 in the 1834 Grimm census.
The following record shows the names of Andreas Hess' only two sons.
1798 Grimm Census 
This next record shows his two sons, step sons to Johannes Albrandt, when they were listed in family #110. These sons are bolded and highlighted in red.
1834 Grimm Census, Family #110 
Here are this unnamed Hess' sons and and their wives in their final 1834 census listing, after they moved out of their step father's home.
1834 Grimm Census, Family #290 
He is not specifically named in this census, but his two sons by an unnamed wife are listed there. The only Hess family in Grimm in the 1775 and 1798 census records was the one descended from Andreas Hess. Clearly he is the father of this Unknown Hess and grandfather of the two young men.
According to the 1798 census records, Andreas Hess only had two sons who could be this Unknown Hess:
This unknown Hess was married to an unknown woman and the couple had two sons.
The boys' father passed away while they were still young children, no older than five and seven. By 1815, their mother, the widow of Mr. Hess, had remarried Johannes Albrandt, who, by virtue of the marriage, became the boys' stepfather.
Johannes Albrandt's children by the boys' mother were:
The unknown mother of all four children died sometime between 1819 and 1834. The fact that her two oldest children were married with no children in 1834 suggests they both had probably married recently, since most young married couples started their families immediately. Had they been married for longer than two to three years, both couples would have likely had children listed in the census.
Prior to their mother's death they most likely lived with their step-father's family and their step siblings and, probably for a time, their mother. It was unusual to find single men living on their own in a separate household.
Note: There are no other Hess family members under the Hess surname in the 1834 Grimm census.
This Unknown Hess profile represents the brothers' father for now. When I can find better documentation revealing their father's name, I will update their profiles accordingly.
Andreas Hess, the brother's grandfather, was in family #49 in the 1798 census, and #89 in the 1775 census. Those two censuses are shown above for reference purposes.
Have you taken a DNA test? If so, login to add it. If not, see our friends at Ancestry DNA.
Unknown is 23 degrees from Johnny Cash, 25 degrees from Patsy Cline, 32 degrees from Gordon Kirkpatrick, 38 degrees from Ruby Hunter, 35 degrees from Reg Lindsay, 30 degrees from Don Messer, 35 degrees from Charley Pride, 27 degrees from Hank Williams, 24 degrees from Tammy Richie and 25 degrees from Laura DeSpain on our single family tree. Login to find your connection.