The reason is I have two sources and two sets of data for these siblings. Thomas Plourde and Marie-Anne Martin were one set of my g-g-grandparents. Their daughter "Leona" Anna born 9/1/1892 is my g-grandmother. I have my g-grandmother's baptism, marriage, and death certificates. I also have death certificates for her sister Anna and brother Thomas. Anna and Thomas are common names in both sets of data. The data and sources are below.
From my great-aunt Loretta, who was the daughter of "Leona" Anna Plourde comes the names of 7 children: Leona Anna b:9/1/1892 (my greatgrandmother) Anna Ella Peter Modeste Valida Thomas
From the Plourde Family Genealogy Book comes the names of 8 children, all born in St. Luce, Frenchville, Maine: Marie-Luce b:3-6-1884 Sophie b:4-25/1885 Annie b:3-2-1887 Thomas b:1-6-1892 Anna b:9-1-1892 (my greatgrandmother "Leona") Alisse b: 4-1-1894 Jean b:8-9-1896 George b:4-17-1898
In St. Mary's Cemetery, Salem, Massachusetts, my g-grandmother "Leona" Anna Plourde is buried with her husband Pierre Philippe Bruno Deschenes. In another part of that Cemetary are the Side-by-side graves of Marie-Anne (Martin) Plourde, Anna (Annie) Plourde, and Thomas Plourde (the son).
So, there I am being able to verify only the names common to both lists of siblings.