| Rosamund Mary Watson |
|Parents|| John Watson |
Mary Morstan (deceased)
|Family|| Harriet Watson (paternal aunt)|
Molly Hooper (godmother)
Sherlock Holmes (godfather)
Martha Louise Hudson (godmother)
|Behind the scenes|
Rosamund is conceived prior to the marriage of her parents John and Mary Watson. During the wedding their friend and Rosie's godfather Sherlock Holmes deduces that Mary is pregnant, and tells them the news during the reception.
Rosamund is named after her mother, having her mother's first and middle name, however her mother's true last name is unknown.
- After she is named it is revealed that her mother's name was originally "Rosamund Mary", her father had liked the name "Catherine".
- "His Last Vow" (mentioned) (Mary's pregnancy)
- "The Abominable Bride" (Mary's bump)