sesqui-first great-cousin-aunt Share definition Flag Daughter of their great-grandparent’s half-sibling with the other great-grandparent’s full sibling. My sesqui-first great-cousin-aunt is a good person. sesqui-first great-cousin-aunt by Hgcloziw November 23, 2019 0 0 Get merch Get the sesqui-first great-cousin-aunt mug. Buy Now — $32.95 See more merch