Thanks all for the input. However whilst I hope I may have found the correct John Foote and don't think I have the correct Delia, which I think throws the existence of a Lynn into doubt. Searching for a death for Delia, hoping to find Lynn, I found that she had in fact died in 1942 in Salt Lake city and that her husband at that time was a Don C Price.
Name: Della Nixon Price
Death Date: 16 Apr 1942
Death Place: Salt Lake City, Salt Lake, Utah
Gender: Female
Age: 63
Marital Status: Married
Race: White
Birth Date: 27 Mar 1879
Birth Place: St George, Utah
Father's name: James William Nixon
Mother's name: Johanna Marie Schultz
Spouse's Name: Don C Price
Document Type: Certificate of Death
The death certificate confirms her parents.
https://www.findagrave.com/memorial/75367565/della-maud-priceThe thing is Delia (or Della) married Don C Price in 1899
Name: Della Maude Nixon
Gender: Female
Age: 20
Birth Date: 1879
Marriage Date: 3 May 1899
Marriage Place: Washington, Utah, United States
Spouse: Don Carlos Price
FHL Film Number: 0484821
and she is on the 1900 census with Don Carlos Price and a child Thomas 3 months.
But the one thing is that the Delia married to John says parents born: Father USA Mother Denmark.
The Della married to Don Carlos says on 1900, 1910 & 1920 parents Father: England, Mother Denmark, but on 1930 says Father Minnesota, Mother Denmark.
But! the Delia/Della who married John had been married to Joseph Hutchison e.g Juanita living with John & Delia in 1900. Juanita's death confirms her parents (I think!):
California Death Index
Name: Juanita D Hallmark
[Juanita D Hutchison]
Social Security #: 558501781
Gender: Female
Birth Date: 29 Jun 1892
Birth Place: Utah
Death Date: 9 Dec 1986
Death Place: San Joaquin
Mother's Maiden Name: Nixon
Father's Surname: Hutchison
A bit confusing???!!! Would welcome your views