- Son-in-law of Sam Waterston.
- Siblings: Annie Parisse, an actress, and Michael Cancelmi, Italian teacher.
- His father is of half Italian and half Slovak and Polish descent. His mother is of half Italian and half Lebanese-Syrian descent.
- His paternal grandfather was an Agent for the Pennsylvania Department of Justice (1934-1941) and a Western Pennsylvania District Supervisor of the State Parole Board (1942-1968).
- His father is a senior executive with Alaska Air and his mother is a first-grade teacher at Newport Heights Elementary.
- Brother in law of Katherine Waterston and Graham Waterston and half-brother in law of James Waterston.
- Parents: Louis G. "Lou" and Annette Cancelmi.
- He is an actor and a writer.
- Has two uncles, Norbert A. Cancelmi, of Bethel Park, and Harry J. Cancelmi, Jr. of Waynesburg, Greene County, Pennsylvania, and three cousins.
- Grandparents: Harry J., Sr., and Mary Smetana Cancelmi.
- His uncle Harry J., Jr. is a defense attorney.
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