weak sister

noun Informal.
1.
a vacillating person; coward.
2.
a part or element that undermines the whole of something; a weak link.

Origin:
1855–60

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
weak sister
 
n
informal (US) a person in a group who is regarded as weak or unreliable

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
However, all of the daughters became rather strong and domineering themselves, with not a weak sister in the lot.
Being a weak sister she will readily yield te our persuasion.
Even riparian protection is a weak sister to this new context.
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