Does the talent to write run in the family? Are relationships built on common interests? Certainly both are true in this BCCLSVisor of family members/spouses who are well-known authors. Some relationships will be obvious to you, some not. Some family members are co-authors, some continue a series after a relative dies, and some write under a different name.
If you're interested in more authors who are related, check out Listology.
Catalog/Collection Development Librarian, BCCLS