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Thank you for your help everyone.
Yes, I had that census record.
Margaret & ArgyllGran
Yes, her sister Nancy adopted them, that's how I know the girls' names as I have a photo of Jane & Nancy's girls with names and ages after the adoption.
My Grandmother & mother were the correspondents, but as they & their generation is America died out, contact was lost. Jane's elder daughter even went on to work for American Airlines despite her parents death on one of their planes.
Very grateful to you all.

The plane crash in which the parents died -

https://en.wikipedia.org/wiki/American_Airlines_Flight_383_(1965)

This tree also has details of the daughters , and their husbands and children;

http://www.thetreeofus.net/8/210667.htm

It says the girls were adopted by a maternal aunt after their parents' deaths. Another of your cousins, Inez?

This is from a tree on Ancestry:

When Jane Parry was born on June 7, 1933, her father, James, was 37, and her mother, Katherine, was 34. She married William Bemis Morris in June 1954. They had two children during their marriage. She died as a young mother on November 8, 1965, in Constance, Kentucky, at the age of 32.

When William Bemis Morris was born on November 20, 1930, his father, Joseph, was 37 and his mother, Hannah, was 34. He married Jane Parry in June 1954. They had two children during their marriage. He died in November 1965 in Constance, Kentucky, at the age of 35.

I'm wondering how you know her daughters' christian names but not their surnames i.e. Jane V.'s married name.

Is this your cousin?

1940 https://familysearch.org/ark:/61903/1:1:KWPD-1M1 [with image link]
Event Place Ward 5, Cincinnati City, Cincinnati City, Hamilton, Ohio, United States
James G Parry Head M 45 Kentucky
Alice P Parry Wife F 35 Ohio
Nancy Parry Daughter F 8 Ohio
Jane V Parry Daughter F 6 Ohio
Oliver P Bardes Stepson M 13 Ohio
David Bardes Stepson M 10 Ohio
Christ Smith Servant M 40 Ohio
Carrie Wright Servant F 25 Georgia

Hello. I am struggling to find the American records I need.
I know my cousin's name & her 2 daughter's Christian names, but not her husband's name and can't find a marriage record including her name.
Her name was Jane V Parry and she was born in 1934. Presuming she got married about 1955 as first child was born in 1957. She and her husband were killed when the children were young.
Thank you.