The 1900 census shows Joseph Webb with his brother Henry Fitzroy Webb - the age wasn't distinguishable
Joseph Webb 48 Henry F Webb
Carrie V Webb 28 Gladys Webb 8
but according to the passenger list immigration record he was born 1854 and aged 40 years on immigration - 19 October 1894 - Britannic.
Henry must have returned to the UK - there is a probate record - passed away 17 January 1939 - probate 14 March to Joseph Henry Londen - Civil Servant - Effects £7 1s 10d
Perhaps this was the birth of Carrie/Caroline in September 1871
https://www.familysearch.org/ark:/61903/1:1:VBT4-F45Sandra