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William David CLOW married Mary Jane MANSELL, Sep qtr 1880, Holborn, 1b 1086. Fits with the second name of one of the sons. Getting the birth cert for William Mansell CLOW would confirm or deny this.
There is a death for a Mary Jane CLOW, Sep qtr 1888, Islington, 1b 174, aged 31 which might be her.
1881
44 President St, St Luke
George T MANSELL, head wid 53, Jeweller, born Middlesex, St Lukes
Charlotte L MANSELL, dau unm 25, Artificial florist, born ditto
George T MANSELL, son unm 20, Keyless watchmaker, born Middlesex, Islington
Elizabeth MANSELL, dau unm 18, Book folder, born Middlesex, St Lukes
Sarah A BEESLEY, visitor mar 29, born ditto
Albert C BEESLEY, visitor mar 29, Bookbinder, born ditto
Mary J CLOW, visitor mar 23, born ditto
next page
Laura A CLOW, dau 1, born ditto
RG11/364/F62/P31
Mary Jane MANSELL birth, Sep qtr 1857, St Luke, 1b 525
1871
31 President St East, St Luke
George T MANSELL, head mar 42, Goldsmith, born Middlesex, St Luke
Sarah A MANSELL, wife mar 43, born ditto
Sarah A MANSELL, dau unm 18, Milliner, born ditto
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Charlotte L MANSELL, dau unm 15, Artificial florist, born ditto
Mary J MANSELL, dau 13, Scholar, born Middlesex, Islington
George T MANSELL, son 10, Scholar, born Middlesex, St Luke
Elizabeth MANSELL, dau 8, Scholar, born ditto
RG10/400/F99/P39 & P40
Ian C