There is an Allen Stokes son of Willie and Susan Stokes, b. Nov. 1878.
Wm G Stokes and Susan have several other children's births Richmond, VA listed on familysearch in addition to Allen. Pickett, Eliza, Wm G. b. 1880 d, 1880.
There is a Wm G Stokes b. 1852 to AY and Mary M. Stokes. In 1900 William G Widowed living with brothers Allan Y Stokes and Thomas D Stokes and Pickett is listed as grandson, but seeing both Allan and Thomas are single males, could be that Pickett is their nephew? These names seem to match. Other records show George P(ickett) Stokes. Seems both this George P and Allan were in the Navy in MD.
You should us the free search tool at: https://familysearch.org/search and to trace the brothers Allan Y, Thomas and William G. Allen Y's parents are listed as AY and Margaret M Tuckett on his death record. Mother is MM on birth. One year it appears their named is misspelled Stoker on census. Some examples below:
Virginia, Births and Christenings, 1853-1917
Citing this Record "Virginia, Births and Christenings, 1853-1917," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/X527-GM6
Allen A. Stokes Male White
Birth Date: 24 Nov 1878 Richmond, Henrico (now Richmond), VA
Father Willie Stokes
Mother Susan Stokes
Indexing Project (Batch) Number: C00682-6
Reference ID: p 539
U S Census, 1900 ED 152 Washington D.C. Navy Yard, Washington, DC
Image Source: https://familysearch.org/pal:/MM9.3.1/TH-267-11394-57751-70?cc=1325221&wc=MMPV-ZS9:1869712898
Allan T or Y? Stokes
Birth Date: Oct 1878 Virginia
Father: Virginia Mother Virginia
White Male Single
Rank Corporal
Residence 153 E Franklin St.
Virginia, Births and Christenings, 1853-1917
Citing this Record "Virginia, Births and Christenings, 1853-1917," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/VRPY-2JF
Wm. G. Stokes Male
Birth 17 Jul 1852 Birthplace: Richmond, Richmond, VA
Father A. Y. Stokes
Mother' Mary M. Stokes
Indexing Project (Batch) Number: C00623-7
U S Census, 1900 ED 71 Precinct 2 Richmond city Ward Monroe, Henrico, VA
https://familysearch.org/pal:/MM9.3.1/TH-266-11664-129092-71?cc=1325221&wc=MMPJ-5C5:757182657
Head Allan Y Stokes M 45 Sept 1855 VA Single
Brother William G Stokes M 47 July 1853 VA Widowed
Brother Thomas D Stokes M 39 Oct 1861VA Single
Grandson Pickett Stokes M 14 Aug 1886 VA (maybe nephew?)
Births of additional children to Wm G and Susan Stokes in Richmond:
https://familysearch.org/search/record/results#count=20&query=%2Bsurname%3Astokes~%20%2Bbirth_place%3Ava~%20%2Bbirth_year%3A1875-1890~%20%2Bfather_givenname%3A%22william%20g%22~%20%2Bfather_surname%3Astokes~%20%2Bmother_givenname%3Asusan~