Making complete comparisons

When you compare two or more things, the comparison must be complete, logically consistent, and clear.

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Different from what? Adding from my friends’ parents completes the comparison.

UNCLEAR Aneil likes his brother more than his sister.

Does Aneil like his brother more than his sister does—or does he like his brother more than he likes his sister?

CLEAR Aneil likes his brother more than his sister does.
CLEAR Aneil likes his brother more than he likes his sister.