I have looked at the 1901 census for Southampton:
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The Thomas Diaper (senior) family were living at 56 Bridge Rd.
Thomas Diaper (junior) and Alfred Diaper were not living at their fathers (Thomas senior) home. Guess they were busy sailing racing yachts! Tom junior was probably married.
However the following brothers and sisters were living with their parents:
John (named Jack in brother Tom Diapers Log) 31
Thomas Diaper senior 62
Eliza Diaper wife 60