 <translate> The fact that one brother has birthday cake sliced while younger brother is smiling doesn't imply that it is the younger brother's birthday.
The final answer: it is not possible to tell. <yor> Bó tilẹ̀ jẹ́ pé wọ́n gé àkàrà ọjọ́ ìbí arákùnrin kan nígbà tí àbúrò rẹ̀ ń rẹ́rìn-ín músẹ́, ìyẹn ò túmọ̀ sí pé ọjọ́ ìbí àbúrò rẹ̀ ni. Ìdáhùn tó ṣe kedere ni pé: kò ṣeé ṣe láti sọ. 