 <translate> The important part for answering this question is: "I'll be a monkey's uncle" has been said to date from after 1925, the date of the widely publicized Scopes Trial in the United States, where the term first appears.
Therefore, the answer is the widely publicized Scopes Trial in the United States. <yor> Apá tó ṣe pàtàkì láti dáhùn ìbéèrè yìí ni pé: "Èmi yóò jẹ́ àbúrò bàbá ọ̀bọ" ni wọ́n sọ pé ó ti wà láti ọdún 1925, ìyẹn ọjọ́ Ìgbẹ́jọ́ Scopes tó gbajúmọ̀ gan-an ní Orílẹ̀-Èdè Amẹ́ríkà, níbi tí gbólóhùn náà ti kọ́kọ́ fara hàn. Nítorí náà, ìdáhùn náà ni Ìgbẹ́jọ́ Scopes tó gba àfiyèsí gbogbo èèyàn ní Orílẹ̀-Èdè Amẹ́ríkà. 