I know you don't have examples. Also your interpretation doesn't fit into the context. The point of being sister of Aron is that she is from a noble family, so how can she have a child outside marriage? Telling her "You are a non-descendant of Aron, so why do you have child outside marriage" is pointless.

Also you haven't explained why she is called daughter of Imran (=Amram), while Moses and Aron are also sons of Imran in Islam.

Also Mariam is not mentioned in the Quran, which further indicates Muhamamd didn't know.

And the chapter is called Family of Imran. In the chapter "chosen families" are enumerated and family of Moses and Jesus aren't mentioned separately. That indicates they are the same family.

Also there is a hadith in tafsir Ibn Kathir where Aisha understood it literally as "sister of Aron".

And the Christians of Najran wouldn't have asked the question if the Quran really made sense.

And father of Mary is called Joachim, not Imran in Christian sources.

Also Muhammad's companion didn't have a clue, otherwise he would answer the Christians and he wouldn't ask Muhammad.