hidden-metaphor

Manx Genealogy

Robert Knowles (station wagon inspector)

I live in Italy and I'm trying to find out about my great-grandfather's family who was originally from the Isle of Man.
This is what I know:
Richard Robert Knowles born in 1887 either in Liverpool or the Isle of Man. His father was Robert Knowles (station wagon inspector), and he had at least 2 bothers and one sister (one brother was Thomas). Two brothers moved to the US, Thomas eventually returned. Richard was a policeman in Liverpool and married Daisy Louisa Thompson in 1912. His sister lived in St Helen's. I think Richard was born in Liverpool but I'm sure family moved to the Isle of Man or was from there originally so presumably Robert (the inspector) was born there? Can anyone help?