1 definition by Martha2010

A female (family member/friend), who is a sister (or like a sister), who helps (usually another female) frequently with cleaning, cooking, childcare, other household duties, etc.

There is no romantic involvement with a sister-wife or her spouse, however she is beloved by the whole family.
Heather is always helping me cook, bake, clean and my children love her too! She is my sister-wife!
by Martha2010 November 23, 2009

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