Mumsnet classic response on this one, I see. Make a tonne of shit up as fast as possible.
Nowhere in the original post was "abroad mentioned". She said he wasn't enjoying his job lately. That is all. She did not say he was working extra long hours and she certainly didn't say she was making him do so, let alone to pay for a fancy foreign holiday for their kids. She also never mentioned "keeping up" with anybody, named Jones or otherwise.
She just basically said, "it would be nice for the kids to have something to talk about".
If we're making stuff up, why not go the whole hog.
OP obviously doesn't have a job and spends all day painting her nails and clip-clopping round in diamond studded Louboutins while the full time nanny looks after the kids so she can whip her husband in to working thirty nine hours a day before he comes home where she makes him cook an eight course meal and scrub all the floors at the same time. She's got to be depriving him of his mummy's love and doesn't care about him at all. Probably threatened to leave him and fuck off to the Bahamas with the hunky pool boy too. Lazy selfish evil witch that she is. She can't read or add up neither so he has to organise everything, on top of working 60 hour a day to pay for it all.
I also very much doubt a man who has been having seizures since childhood, as OP stated, has not seen a doctor. He has a long-standing medical condition that might need a fresh visit but that's his call. That is for him, as a fully competent adult male, to decide and sort out. It is his responsibility, not OPs and certainly not his mummy's.
I give up with this place, I really do.