Donald Michael "Donnie" Thornberry is an adopted dull-witted son of Marianne Thornberry and Nigel Thornberry, and brother of Debbie and Eliza Thornberry.
- The Orangutans (parents; deceased)
- Eliza Thornberry (Adoptive younger sister)
- Shane G. (Adoptive brother in law)
- Darwin Thornberry (Adoptive pet)
- Debbie Thornberry (adoptive older sister)
- Nigel Thornberry (adoptive father)
- Marianne Thornberry (adoptive mother)
- Tyler Tucker (cousin)
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