DreamForth Interpretation: To dream of your sister-in-law symbolizes attributes that the both of you may have in common. Also, contemplate the bond that you both share.
If you are arguing with your sister-in-law, it may imply that you refuse to accept that you both have certain aspects or attributes in common.
See People metaphors also see Brother-in-Law.
1. Religious church; Natural sister-in-law.
Same as Sister.