I think BA has created guard rails around this when he asked shareholders to vote for only allowing the selling/passing of shares by the kids onto their direct descendants. I'm sure this doesn't stop Xavier from acquiring shares in LVMH by simply purchasing shares. There were other measures, but I don't remember specifics, all with the intention to ensure only Arnaults remained majority share holders of LVMH.
Delphine's ex-husband became a shareholder after they were married, attended the shareholder meetings, etc. BA probably didn't want to make the same mistake twice, but the measures were made way after Delphine's daughter with Xavier was born. Bernard hated his guts from the beginning, so I wonder what took him so long. Some say it was brought on by Antoine's marriage to Natalia, is probably all of the above.
There was a rumor of a rift between Xavier and BA's wife reported in Challenges sometime last year. But, I doubt Delphine will take sides in any event, I'm sure she'll put the company first. Or her brothers will intervene to not hand anything over to Xavier. I'm sure they love their sister, but the family business/legacy is more important to them.
Likely only from a creative POV, tbh. As much as I stan, I think it's hard to care about politics when they will rarely affect you, unless they are being taxed. I think Niel just tries to appeal to the working/middle class. I'm more cynical about, I think he is trying to seek some kind of political office in the future. Which is odd considering how private Delphine is, but I don't doubt it. He has a brilliant PR machine, plus he owns multiple media outlets and so do his in-laws. I still can't stand him, there is something about him I don't trust. Not that he's a billionaire, because BA is, but BA does not hide his terrible personality and arrogance.
I'm sorry but he needs to stop being compared to Steve Jobs. Not even close. He might be France's make-a-wish Steve Jobs at best. And I'm not a Steve Jobs, fan girly, they are just not on the same level. But he has used his PR to cultivate his down-to-earth, "I'm poor and a stupid loser like you", persona. Which might be why I dislike him, with BA you know what you are getting, he's not likeable and he knows it. When people try jump through hoops to be likeable, that's when I side-eye them.