This one, because they're used as proper names:
'I was telling Mum and Dad the other night about your wonderful news' |
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Titles, too, take the same capitalisation as the noun they go with. For example:
"Where were you when the crime took place?" asked Inspector Jones.
I told the inspector I couldn't remember. |
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(I.e. "inspector" is capitalised the first time, because it's part of a proper name, whereas the second time it's being used as generic noun.)
That's what I was taught at school, anyway.
Alex