Frederick married Minnie Maria Thatcher between 1 Jan 1904 and 31 Mar 1904 in Staines District, Middlesex, England. Minnie (daughter of William Thatcher and Alice Mary Maud Sherwood) was born about 1883 in Mortimer, Berkshire, England; died after 1911. [Group Sheet]

1. Daisy Evelyn Minnie Johnson was born between 1 Jul 1904 and 30 Sep 1904 in Egham, Surrey, England; died after 1911.
2. Lucy Alice Johnson was born between 1 Jan 1906 and 31 Mar 1906 in Staines, Middlesex, England; died after 1911.
3. Edith Mary Johnson was born between 1 Jan 1908 and 31 Mar 1908 in Staines, Middlesex, England; died after 1911.