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well they both share an auntie & an uncle
i think maybe cousins in law suits it, since the connection only exists because of marriage, not blood.
some people say grand-cousins, but not sure that works
& others just say cousin of cousin
its odd that theres no 'official' name, since there must be a lot of people who know & care for their cousin in laws etc
they are both at all family occasions, funerals, as well as smaller get togethers, so its not like they dont interact
i suppose that would also make me an auntie in law to her