When Iva died so young at 31yo her daughters were only 7 and 5yo. They lived for some time with their grandparents then went onto mature and marry.

Name: Rob V Young Home 1900: Justice Precinct 8 Coryell Texas Age: 28 Birth Date: Jan 1872 Birthplace: Texas
Race: White Gender: Male
Relationship to Head of House: Head
Father Birthplace: Georgia Mother Birthplace: Georgia Spouse name: Sarah F Marriage Year: 1893
Marital Status: Married Years Married: 7
Residence: Justice Precinct 8 West Part Coryell Texas
Household Members: Name Age
Rob V Young 28
Sarah F Young 22
Ivy L Young 6 1894 dau
Infant Young 2/12 son 1899 Ernest

1910 US Fed Census about Iva Young Age 1910: 15
Birth Year: 1895 Birthplace: Texas
Home 1910: Justice Precinct 8 Coryell Texas
Race: White Gender: Female
Relation to Head of House: Dau Marital Status: Single
Father Name: Robert V Young Father Birthplace:Tex
Mother name: Sarah F Young Mother Birthplace: Tex

1920 Census Coryell County, TX
Household Gender Age
Matthias J Cook M 50y 1870
Spouse Iva L Cook F 27y 1893
Child Frances Cook F 2y4m 1918 Johnnie
Child Nora J Cook F 0m 1920 Janelle

[the 2 kids are w/their grandparents 1930]
Name: Robert V Young Home 1930: Precinct 8 Coryell Texas Age: 58 Est birth year:abt 1872 Birthplace:Texas Relation to Head of House: Head Spouse's name:Sarah F Race: White
Household Members: Name Age
Robert V Young 58
Sarah F Young 52
Love D Young 26
Paul R Young 16
J Frances Cook 12 1918 granddaughter << Johnnie
N Janelle Cook 10 1920 granddaughter Nora <<

Iva and Matthias had 2 daus
Johnnie Francis b Sep 4 1917 d Oct 11 1989 Wichita Falls TX Burial: Our Savior's Lutheran Cem Norse Bosque Co Tex
+Barney Elmo Swenson B Mar 9 1908 D Jan 16 1950 McLennan Co TX Burial: Our Savior's Lutheran Cem Norse Bosque Co Tex

Nora Janelle b 1920

Iva's brothers and sisters were
1Iva Lawson Young
2Otho Debbs Young 1895-1896
3Nellie Blye Williams 1896-
4Ernest Kelly Young Mar 1900 d same
5Victor Francis Young 1900-1955
6Young, Infant 1902-1902
7Love Durham Young 1903-1986
8Robert Boone Young, 1905-1930
9Macil Young 1909-1909
10Mary Gladys Young 1910-1987 +Willie Mack Mayhew
11Paul Ray 'Sonny Boy' Young 1913-1970 +Elizabeth Yows

Mary Gladys Mayhew Hamilton County Cem Record Book & 1920 census confirm her name as Iva:
[courtesy of cousin # 47271637]

Iva Cook Texas Deaths (New Index, New Images) 1890-1976
birth: 01 May 1893 Texas
death: 02 Dec 1925 Jonesboro,​ Coryell,​ Texas
parents:R V Young,​ Sarah Kelly
gender: Female marital status:Married
certificate number:42291 digital folder number:005145346

Texas Death Index 1903-2000 Iva Cook
death: 02 Dec 1925 Coryell​ Tex certificate #42291