Well, as you write all those sentences in present tenses (except for the 2nd one, which has no verb, but you can still understand it's supposed to be present), it can't really mean "previous". I think it all means "final". However, "final" and "previous" have very similar meanings, so I believe it's hard that they'll generate any confusion.
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CliveWhat do you mean when you say 'my last brother'?eg Do you mean your other brothers all died?no, I mean last in the list.