1. She married [ a ] son of the Louis Vuitton owner.
2. She married [ the ] son of the Louis Vuitton owner.
I think both are correct. When there is [a], it means, the speaker focuses on the fact that the speaker doesn't have any clue about the son. He could be the 1st one or the 2nd one or something else. When there is [the], it sounds like emphasizing Louis Vuitton. He is not a son of someone in a common family.
Am I wrong?
And is it incorrect to put [the] before Louis Vuitton owner?
Thank you!