A sister of George' s is coming to stay with us. ->> this is the correct form.
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InchoateknowledgeA sister of George's is coming to stay with us. (double genitive)
A sister of George is coming to stay with us.
Both sentences are correct grammatically.
Is there any difference between them?
Dj Bueno A sister of George's is coming to stay with us
Did you find it somewhere?No, I asked, just out of curiosity.
..... a friend of Bertha's is certainly preferable to a friend of Bertha