Name: Charles Deetz
Relationship to Thorn: maternal uncle (mother's brother in law)

Name: Delia Deetz
Relationship to Thorn: step aunt

Name: Lydia Deetz
Relationship to Thorn: cousin

Name: Edward Gracey
Relationship to Thorn: maternal uncle/godfather (mother's cousin: deceased)

Name: Fester Addams
Relationship to Thorn: paternal uncle (dad's twin brother)

Name: Finis and Maudeline Everglot
Relationship to Thorn: paternal uncle and aunt (Dad's brother and sister in law: estranged)

Name: Emily Everglot
Relationship to Thorn: cousin (deceased)

Name: Victoria Everglot
Relationship to Thorn: cousin

Names: Baltus and Lady Van Tassel
Relationship to Thorn: uncle and aunt (Dad's sister in law's brother and sister-in-law)
(Basically, Gomez's brother, Finis married Maudeline. Maudeline's brother was Baltus Van Tassel.)

Name: Katrina Van Tassel
Relationship to Thorn: distant cousin

Name: Helen Kingsleigh
Relationship to Thorn: paternal aunt (Dad's older sister)

Name: Charles Kingsleigh
Relationship to Thorn: paternal uncle (Dad's brother in law)

Names: Margaret and Lowell Manchester
Relationship to Thorn: cousins

Name: Alice Kingsleigh
Relationship to Thorn: cousin

Names: Cousin Itt and Margaret
Relationship to Thorn: cousins

Name: Dracula
Relationship: maternal grandfather

Name: Grandmama/Granny
Relationship to Thorn: maternal grandmother

Name: Barnabas Collins
Relationship to Thorn: ancestor (mother's side)

Name: Jack Skellington
Relationship to Thorn: ancestor (father's side)

Names: Winifred, Mary, and Sarah Sanderson
Relationship to Thorn: distant cousins