- Brother of Scott Foley.
- Brother-in-law of Marika Dominczyk.
- Ex-brother-in-law of Jennifer Garner.
- Attended Colby College in Waterville, Maine.
- His brother, Scott Foley, used Sean's experience as a Head Resident of a dorm during college as inspiration for his role on Felicity (1998).
- He is the son of Constance Jean (Kellerman), who was born in Honolulu, Hawaii, and Hugh Henry Foley. He is of Irish, as well as Scottish, English, German, and one eighth Portuguese, descent.
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