(He is possibly buried to the right of his mother, Nancy Waddle Crow, where there is a grave marked by a field stone.)
From 1900-1920 census records Irby Crow was married twice. Mary Crow being his first wife. On the 1900 Census Irby & wife Mary had been married 4 years with daughter Lila May Crow age 1, & Lula Crow, age 13, niece, (Lula Crow, married Freeman Bell) she was a niece of Mary Crow. Mary was a daughter of Casey/Cassey Crow who is believed to be a daughter of Alfred C. & Nancy Crow. (not proven). Lula Crow Bell being the daughter of Malissie Crow FAG #11752383.
On the 1910 Census Irby Crow is married to Ella Willard Crow, for 2 years. Ella had two know children that are listed in census records below.

The 1900 United States Federal Census
Youngs, Laurens Co., SC
Household Members:
Irby Crow 23, head, b. May 1877, married 4 yrs.
Mary Crow 42, wife, b. Jan 1858, married 4 yrs., mother of 2-1 living
Lila May Crow 1, daughter, b. Mar 1899,
Lula Crow 13, niece, b. Sept 1887 (Lula Crow Bell, 1886-1980, Fag #69939591)

Irby Crow
The 1910 United States Federal Census
Woodruff, Spartanburg Co., SC
Household Members:
Grby Crow 38, married 2 yrs.
Ella Crow 40, married 2 yrs., children born 2-2 living
Robert Crow 16 son, married 1 yr. (Robert Toy Willard, 1892-1941 FAG #55138084)
Lizzie Crow 17 daughter-in-law, married 1 yr. (Lizzie Bell Willard, 1892-1951, FAG #57792630)
Lillie M. Crow 11 daughter

The 1920 United States Federal Census
Cross Anchor, Spartanburg Co., SC
Household Members:
Irby Crow 51 head
Ella Crow 55 wife
Annie Clevenger 38 step daughter, married. (Annie Willard Clevenger, 1880-1920, buried Cedar Shoals, unmarked grave, FAG #196826481)
Lillie Crow 20 daughter, married
Broalas Crow 8 g-son
Mary? (Mury?) Crow 1 g-son
(Info updated 4/10/2018)