Clemens is getrouwd met Isabelle Marie Pouloit op 26 sep 1945 in Corcoran Township, Hennepin, Minnesota, Amerika. Isabelle (dochter van Ephrem Edward Pouloit en Agnes Mary Laumen) is geboren op 8 jun 1922 in Loretto, Hennepin, Minnesota, Amerika; is gestorven in mrt 2009 in Minneapolis, Hennepin, Minnesota, Amerika; is begraven op 30 mrt 2009 in Saint Michael Cemetery (New), Saint Michael, Wright, Minnesota, Amerika. [Gezinsblad] [Familiekaart]

1. Lawrence Robert Barthel is geboren op 5 jul 1949 in Minneapolis, Hennepin, Minnesota, Amerika; is gestorven op 25 nov 2013 in Minneapolis, Hennepin, Minnesota, Amerika; is begraven op 2 dec 2013 in Saint Michael, Wright, Minnesota, Amerika.
2. Francis Joseph Barthel is geboren op 1 mrt 1951 in Buffalo, Wright, Minnesota, Amerika; is gestorven op 26 aug 2012 in Minnesota, Amerika; is begraven op 29 aug 2012 in Saint Michael, Wright, Minnesota, Amerika.
3. LeRoy Alfred Barthel is geboren op 20 apr 1952 in Buffalo, Wright, Minnesota, Amerika; is gestorven op 24 okt 2018 in Saint Michael, Wright, Minnesota, Amerika; is begraven in Saint Michael Cemetery (New), Saint Michael, Wright, Minnesota, Amerika.
4. Brenda Barthel
5. Cindy Barthel
6. Mark Barthel
7. Nancy Barthel