From familysearch.org. Marriage record online: Census lists their childrens names.
https://familysearch.org/
US Census, 1920 Precinct 1 Lynn City Ward 7, Essex, MA
SELF Nath Shepard M 31y NL
WIFE Myra Shepard F 25y NL
SON Edward F Shepard M 3y7m MA
US Census 1930 Lynn, Essex, MA
Head Nathaniel Sheppard M 40 NL immig abt 1903
Wife Myra Sheppard F 36 NL immig abt 1910
Son Edward F Sheppard M 14 MA
Son Lester H Sheppard M 8 MA
Dau Myra Sheppard F 6 MA
Dau Mary A Sheppard F 3 MA
Dau Florence Sheppard F 1 MA
Niece Helen Snow F 20 NL
Nephew Mark Snow M 18 NL
https://familysearch.org/pal:/MM9.1.1/N466-Y29
Massachusetts, Marriages
Name: Nathaniel Sheppard
Titles: Carpenter
Event: Marriage 28 Apr 1913 Allston, MA
Age: 23
Marital Status: 1st
Marriage Registration Year: 1913
Marriage Registration Place: Cambridge, MA
Estimated Birth Year: 1890 NL
Father: Levi Sheppard
Mother: Alfreda Barrett
Spouse: Myra Snow
Titles: Factory operator
Age: 22
Marital Status: 1st
Est birth; 1891 NL
Father: Edward Snow
Mother: Mary Pickett
Massachusetts, Births
Name: Shepard (male)
Birth 30 Jun 1913 Cambridge, Middlesex Co., MA
Parents: Nathaniel Shepard Myra Snow