Both are fine. The double possessive is commoner in speech, perhaps.
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KayohI cannot decide which one is normal, or commoner.I wouldn't say: H
Her eyes are bigger than those of her sister.
Her eyes are bigger than those of her sister's.
I'm thinking of "a friend of mine", so I'm confused.
Thank you for your kind answer in advance.
Watchayakan Also, it should be 'more common' instead of 'commoner.' 'Commoner' is used as a noun to refer to a person.Commoner is perfectly all right as a comparative of common.