In the novel After the Funeral, Anthony Carson was the husband of Geraldine, the sixth child of Cornelius Abernethie, and younger sister of Richard Abernethie. No background information is given about Anthony in the text but his name is listed in the family tree depicted before the first chapter. Anthony and Geraldine had one daughter, Rosamund. Both Anthony and Geraldine were already deceased at the beginning of the events in the book.
The Abernethie family tree is simplified and abbreviated in the ITV TV adaptation but Geraldine's branch is still represented although her husband's name is not mentioned. Geraldine has two daughters in this adaptation, Rosamund Shane and Susanna Henderson (renamed from Susan Banks and who came from a different branch in the original). As Susanna is not married and has the last name "Henderson", this implies that Geraldine's husband's last name here is Henderson and not Carson.