| lineage | |
| mutual | |
| near of kin(expression, idiom) | |
| next | |
| pertinent | |
| quin | |
| quint | |
| quintuplets | |
| relevant | |
| second cousin(expression, idiom, consanguinity) | |
| siblings | |
| sibs | |
| similar | |
| triplet | |
| twice |
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| APA | Smart Define. (2015). sib thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/sib/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "sib thesaurus" https://smartdefine.org/sib/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, sib thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/sib/thesaurus/synonyms>. |
| MLA | Smart Define. "sib thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/sib/thesaurus/synonyms> |