Simply awesome stuff!!!
Yes, the Richey thing is bizarre, as it is absolutely the correct family.
Thomas Richey names Robert Richie (actor) as his father on 1914 army papers, and Catherine Ferguson ( almost certainly nee Hollingsworth) as his sister.
We know he resided with her when she was a married woman.
Yet Katherines father is listed from a very early stage as Thomas Hollingsworth (per 1861 census)
An Isabella and Thomas Hollingsworth marriage certificate may help.
Perhaps Thomas Richey was 'taken in' by the Hollingsworths,
1861
RG9 179 108 11
Portugal Street, St Clements Dane (near the Strand)
Thomas Hollingsworth 34 bookbinder bn Southampton
Isabella 33 bn London
Emily 7
Katherine 5
Helen 1 all bn London
looks like the girls!
now we need to see why brother has surname Richey ....