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We use the double genitive (of + name + 's, his, mine etc) when we want to emphasise the person who possesses rather than the thing which he possesses. A friend of his is simply another way of saying one of his friends.
Don't use the relative pronouns which and what after everything, all, something, anything, a lot, (not much), little, or nothing. We can use that after these words, or it can be omitted.
In telling time, say half past one, half past two, half past three, etc.