Here are some records that might pertain to your family. Do you know if these are the right people? (You didn't mention dates of birth in your post.)
I'll wait to hear from you before doing more searching.
I don't post information online about living people - I think that's generally the etiquette - but you might get private emails with information about the living people you mention.
BIRTH RECORD Johnson, Florence Lillian (could be the right Florence; need more evidence to prove it) Date of Birth: 01 Aug 1904 Mother Maiden Name: Hilda certid# 1904-35042 County of Birth: Hennepin MARRIAGE of Florence’s daughter Alice Victoria Johnson married Johnny Adolph Anderson 14 December 1941 in Kanabec County, Minnesota
BIRTH RECORD Johnson, Agnes Victoria Date of Birth: 26 Aug 1906 Mother Maiden Name: Johnson certid# 1906-34606 County of Birth: Hennepin
BIRTH RECORD Johnson, Ruth Marvel Edella Date of Birth: 13 Apr 1909 Mother Maiden Name: Johnson certid# DC-24782 County of Birth: Hennepin
DEATH RECORD Johnson, Raymond O. Date of Birth: 13 Mar 1910 Place of Birth: Minnesota Mother Maiden Name: Johnson certid# 1969-MN-027244 Date of Death: 14 Oct 1969 County of Death: Hennepin