Translation of ないもの

Question

兄さんが私の相手をするはずなんてないもの。

I couldn't understand the above sentence properly, especially the なんてないもの part.

I have looked for the meaning of 相手をする that can be translated as keep someone company or to take notice, and in my interpretation of the sentence would be "paying attention".

ないもの literally would be something that doesn't exist.

So, can I translate the sentence as follow:

"It would have been asking for the impossible for my brother to pay attention to me."

Thank you for the guidance.

Answer 1

兄さんが私の相手をするはずなんてないもの。
There is no way my brother would pay attention to me, you know.

This is a combination of the following three grammar points:

• The はずがない sentence pattern
  • Learn JLPT N4 Grammar はずがない
• なんて that replaces が/を/etc
  • Learn JLPT N3 Grammar なんか・なんて・など
• もの as a sentence-end particle used to justify/explain something (often もん in informal speech)
  • Learn JLPT N2 Grammar もの

So the simpler version of this sentence is 兄さんが私の相手をするはずがない. From this, が was replaced by なんか to add negative emotion, and もの was added to add the nuance of "you know" or "you see".