There are 6 books in the The Family Skeleton Mysteries series. The newest book is The Skeleton Stuffs a Stocking which came out in 2019.

A woman discovers the literal skeleton in her family’s closet in the first Family Skeleton Mystery!
 
Moving back into her parents’ house with her teenage daughter had not been Georgia Thackery’s “Plan A.” But when she got a job at the local college, it seemed the sensible thing to do.…
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2
The Skeleton Takes a Bow

Book cover of The Skeleton Takes a Bow
And the best performance as a skull goes to…

After years of hiding in the Thackery family house, Sid the skeleton is delighted to finally have his moment in the spotlight. He’s starring in a high school production of Hamlet. Well, not so much starring in as being a prop.…

4
The Skeleton Paints a Picture

Book cover of The Skeleton Paints a Picture
“Dr. Georgia Thackery is smart, resourceful, and determined to be a great single mom to her teenager. Georgia is normal in every respect―except that her best friend happens to be a skeleton named Sid. You’ll love the adventures of this unexpected mystery-solving duo.” ―Charlaine Harris, #1 New York Times bestselling…

5
The Skeleton Makes a Friend

Book cover of The Skeleton Makes a Friend
Georgia Thackery is feeling pretty good about her summer job teaching at prestigious Overfeld College, and she’s renting a rustic cabin right by a lake for herself, her daughter, Madison, and her best friend, Sid the Skeleton. Together again, the trio are enjoying the quiet when a teenager named Jen…
"Mirth and murder blend beautifully in Perry’s sixth whodunit featuring Sid, a skeleton who can move around, talk, and search the internet for clues. . . . Cozy fans who enjoy their mysteries leavened with humor will find their funny bones tickled." ―Publishers Weekly, starred review

Sid is back with…