I'm don't have the marriage book, but according to some information from Ancestry.com I found your family.
Name: Leroy Clinton Stewart Parents: David Jonathon Stewart , Ida May McCrory Birth Place: Marion, Stayton, OR Birth Date: 17 Feb 1897 Death Place: San Diego, San Diego, CA Death Date: 16 Dec 1966
Name: Leroy C Stewart Home in 1900: Preston, Clark, Washington Age: 3 Estimated birth year: abt 1897 Birthplace: Oregon Relationship to head-of-house: Son Father's name: David J Mother's name: May J Race: White Household Members: Name Age David J Stewart 37(born in Missouri abt 1863) May J Stewart 31(born in Massachusetts abt 1869) Leroy C Stewart 3(born in Oregon abt 1897)
David Jonathan married Ada Ellis 16 Jan 1907
Name: Ada Stewart Age in 1910: 45 Estimated birth year: abt 1865 Birthplace: Iowa Relation to Head of House: Daughter Father's name: Jason Father's Birth Place: New York Mother's name: Mercy A Mother's Birth Place: Pennsylvania Home in 1910: Franklin, Linn, Iowa Marital Status: Married Race: White Gender: Female Household Members: Name Age Jason Ellis 83 Mercy A Ellis 73 Mary Ellis 38 Elemer Ellis 26 Ada Stewart 45 Lerory Stewart 13(born abt 1897 in Oregon) Note - I don't know where David was living in 1910, but he was in the 1915 Iowa State Census in Mt. Vernon, Linn Co.,. Iowa. His occupation was solicitor and he earned $600 during a year.
1915 Iowa State Census:
Name: Leroy Stewart Census Date: 1915 Residence County: Linn Residence State: Iowa Locality: Mount Vernon Birth Location: OR Marital Status: Single Gender: Male Estimated birth year: abt 1897 Race: White Mother's Birth Location: Minnesota Father's Birth Location: Missouri Line: 992 Roll: IA1915_307
1920 Census: Note - last name spelled incorrectly
Name: David J Steward Home in 1920: Franklin, Linn, Iowa Age: 56 years Estimated birth year: abt 1864 Birthplace: Missouri Relation to Head of House: Head Spouse's name: Ada Father's Birth Place: Kentucky Mother's Birth Place: Missouri Marital Status: Married Race: White Sex: Male Home owned: Own Able to read: Yes Able to Write: Yes Image: 862 Household Members: Name Age David J Steward 56 Ada Steward 55
1930 Census for Ada Stewart
Name: Ada Stewart Home in 1930: Franklin, Linn, Iowa Age: 65 Estimated birth year: abt 1865 Birthplace: Iowa Relation to Head of House: Head Race: White Household Members: Name Age Ada Stewart 65(listed as divorced) Mae Boxwell 57(boarder) Dawson Schlemmer 24(boarder)
Info about David Jonathon Stewart
Name: David Jonathon Stewart Spouse: Ada Ellis Parents: SamuelStewart , Delila L Boone Birth Place: Jackson CO, Kansas City, MO Birth Date: 12 Feb 1863 Death Place: Old Soldier S Home, Washington, D Death Date: 5 Sep 1958
I hope this helps. I found only one child born to Ida May McCloskey and David Stewart.