Casalguidi,
I've just come from a page by page search, and came to the same conclusion, that there was an error in compiling the index. I'm convinced enough to spend £7 on a certificate anyway, which should prove it either way . . . wish I'd logged in to RC again before searching and saved myself the time, but it's good to get a second opinion . . . especially when it agrees

pjbuk007,
I did wonder if perhaps he had been adopted or fostered. His eldest sister, age 13, remained with their father when their mother died. The 12 year old sister was staying with an aunt on the 1871 census, and was married at 19, before the 1881, so may well have lived with the aunt during that time. I can't imagine the father giving up his only son lightly, but he may have felt it was for the best . . . if indeed that's what happened. The memo does make me think perhaps he didn't die young after all.
JAP,
These are the census entries:
RG10/563/15/21Thomas Foss Head Shipwright b.1829 Beaulieu
Martha Elizabeth Foss Daur b.1859 London
Thomas Herbert Son b.1864 London
RG10/547/71/2Ann Hincken Head Wid 60 (b.Lynn,Norfolk - where Martha's family came from)
Thomas Henry Wye Son-in-law 31
Julia Elizabeth Wye Daur 21
Anne Julia Wye Grandaur 2
Thomas Henry Wye Junr Grandson 10mo
Martha Priscilla Foss Visitor 39 (nee Press. Thomas Herbert's mother)
RG10/875/73/17William Gawtrey Head 21 Smith & Farrier
Elizabeth M Gawtrey Wife 23
Sarah Press Lodger 44 Accoucheuse from [?] lying in hospital (Winifred's aunt)
Winifred Foss Visitor 10 (Thomas Herbert's other sister)
Thanks for the help so far, you've set me off on a whole new search . . .

Mike.
PS. This is the father and daughters c.1895
