forty-second cousin

plural forty-second cousins

1. humorousAny very distant relative.

   So Jessie's my second cousin once removed or forty-second cousin or something. Anyway, we're kind-of related.

   2019, Sue Lawrence, Down to the Sea

   2 more examples

   And also my step-sister, my niece, my fourth cousin, my thirty-third cousin, my forty-second cousin, my great-aunt, my grandmother, my widowed sister-in-law-and next week she will be my wife.

   1879, Mark Twain, The Great Revolution in Pitcairn

   "Is he a relation of ours, too, Cousin Jimmy?" "Forty-second cousin. Way back he had a cousin of Mary Shipley's for a great-something. […]

   1923, Lucy Maud Montgomery, “Chapter 7”, in Emily of New Moon