John Sellick -father John Sellick married Elizabeth Fish Webber father Thomas occ Fisherman 07 May 1885
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In 1901 they are living with John's mother Elizabeth and have the following children,
Elizabeth Jane
Thomas JohnAgnes MMRosa May
Albert James
George Mafeking
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Birth registrations for Elizabeth and Thomas John which I posted earlier
SELLICK, ELIZABETH JANE mmn WEBBER
GRO Reference: 1886 March Quarter in WILLITON Volume 05C Page 297
SELLICK, THOMAS JOHN mmn WEBBER
GRO Reference: 1888 March Quarter in WILLITON Volume 05C Page 296
also Agnes who you have not listed
SELLICK, AGNES MAUD MARY mmn WEBBER
GRO Reference: 1894 M Quarter in WILLITON Volume 05C Page 282
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There are also these birth registrations

SELLICK, LILY mmn WEBBER
GRO Reference: 1890 June Quarter in WILLITON Volume 05C Page 281
Death
SELLICK, LILLY age 0
GRO Reference: 1890 Dec Quarter in WILLITON Volume 05C Page 229
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SELLICK, LILLY mmn WEBBER
GRO Reference: 1891 Dec Quarter in WILLITON Volume 05C Page 286