We found one dictionary that defines the word siblings in law:

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1. siblings-in-law: Wiktionary

▸ Words similar to siblings in law ▸ Usage examples for siblings in law ▸ Idioms related to siblings in law ▸ Wikipedia articles (New!) ▸ Words that often appear near siblings in law ▸ Rhymes of siblings in law ▸ Invented words related to siblings in law