This branch of the Bytwerk family is descended from Peter (1897-1976) and Ida (Musch) (1894-1981) Bytwerkof Muskegon Michigan, who had four sons:
- Robert Bytwerk (b. 1926): Married to Ruth Bytwerk (1927-1999). Three surviving children:
- Randall Bytwerk (b. 1950): Professor at Calvin College, Grand Rapids, Michigan. Married to Sharon Bytwerk. One surviving child:
- David Bytwerk (b. 1980).
- Katharine Bytwerk (1984-1996).
- Beth Byrne (b. 1955), of Rockford, Michigan
- Heather Byrne
- Aaron Byrne
- Jeanne Bytwerk Vander Veer (b. 1961) of West Olive, MI, married to Grant Vander Veer.
- Sophia Grace Vander Veer (b. 1999)
- Gavin Robert Vander Veer (b. 2002).
- Daniel Bytwerk (1951-1955).
- Randall Bytwerk (b. 1950): Professor at Calvin College, Grand Rapids, Michigan. Married to Sharon Bytwerk. One surviving child:
- Edward and Betty Bytwerk of Spring Lake, MI. Three children:
- Diane Elaine Hanway of Marshall, MI.
- Barbara Sue (Bytwerk) Labrie, a veterinarian practicing in Grand Haven, MI.
- Scott Bytwerk
- John (1922-2007) and Mary Bytwerk of Muskegon, MI. John was formerly married to Nellie Bytwerk (d. 1999). Three surviving children:
- Susan
- Bruce Bytwerk, married to Luanne Bytwerk. Muskegon, MI. Four children:
- Benjamin Bytwerk (b. 1988)
- Bethany Bytwerk (b. 1992)
- Noah Bytwerk (b. 1996)
- Nicholas Bytwerk (b. 1998)
- Janice and Laurens Ten Kate
- Patricia Medendorp (1946-1980)
- Clarence Bytwerk (1928-1979).
Randall Bytwerk 