I am going to my sister Arlene's house. Use sister as a noun modifier. It is quite common in this kind of sentence.
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But you may have a sister whose name isn’t Arlene? (You forgot a comma before whose.)
goronsky:
the rules state that commas must come fore and aft in the following:
My sister, Arlene, is getting married.
The commas tell the reader that I have only one sister whose name is ‘Arlene’.
goronskyI have only one sister, and the rules state that commas ...I don't know what rule you're referring to, but you don't need commas in your example.
goronskyThe commas tell the reader that I have only one sister whose name is ‘Arlene’.I'm not surprised. But common
goronskycould mean that I'm telling Arlene that my sister is getting marriedThat would not be used, except in the context of a dialog where it is clearly established that you are talking to a woman named Arlene.