Original: Postgate married Prudence Myers in 1957, becoming stepfather to her three children (Kevan, Kerris and Krispian). The couple had twins in 1959 (Stephen and Simon); and another son in 1964 (Daniel).
Simplified: Postgate married Prudence Myers in 1957, becoming stepfather to her three children The couple had twin boys in 1959 and another son in 1964 Prudence died in 1982.