Dutton / Benzie / Cullum

My grandfather was Terrence Frazer Cullum (b. 1916) born in the Dorset area of England, His father was I believe also Terrence and his mother was Hazel Benzie, she also had two other sons by a man called Dutton and she died in the 1930's. My granfather married Joan Helenor Jones who died in the 1990's on the Isle of White. Anyone with any information please let me no.