Why did Joseph (peace be upon him) say, "O my father, I saw eleven stars and the sun and the moon—I saw them prostrating to me," instead of "my father," and to whom was the prostration?

Joseph's saying "إني" (Indeed, I) is a confirmed report about himself, indicated by the first-person singular pronoun (ياء المتكلم). The one who saw the vision is Joseph. Those who prostrated are his eleven brothers, and his father and mother. The stars are his brothers, and the sun and moon are his parents, or the sun is his maternal aunt if his mother had passed away. The letter "تاء" (tāʾ) in "أبت" (my father) is specific to the words "الأب" (father) and "الأم" (mother) in vocative address, implying addition to the first person, and its meaning is "O my father." It serves as a substitute for the first-person singular pronoun "ياء المتكلم."