@gembeldolar Try the other side of it? He's hiring people like his mother, giving them a job. And if it's too much of a drain, you cancel it.
And it doesn't have to be daily- having someone come in every 2 weeks or once a month to clean, you still have to run around and pick everything up first so they can get to the surfaces to clean. Maybe mowing only (as a test), he can still do the hedges or the garden (depends on your yard).
Do it for 6 months or one year, and see how he is at the end. Are you able to have more time doing what you want, and enjoy life more? High end usually means high stress, and linger hours. Exercise and I suppose chores help with that, but also just having downtime where you're not running from chore to chore.
My brother went through this. His wife had to pretty much teach him to spend money, not like crazy blowing money, but bigger houses are a lot of work, working 10 hour days now mean chores push into family time. Family is most important, so we all need time together, just hanging out relaxing and connecting.