- Ashes are under an oak tree at the top of St. Mary the Virgin Churchyard, Chapel Bank, Ebony, Isle of Oxney, Kent, England next to his mother, Lady Sinden. Both trees have inscribed plaques under them.
- Son of actors Donald Sinden and Diana Sinden.
- Was best friends with fellow actor Simon Cadell, who also died of lung cancer, at the same age of 45, just three months before Sinden in 1996.
- Older brother of actor/producer Marc Sinden.
- Daughters Kezia & Harriet
- Nephew of Leon Sinden.
- Ex-brother-in-law of Jo Gilbert.
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