People aren’t well behaved at all! Your advisers are right about this and will have seen all kinds of bad behaviour over the years.
Just to give an example - we don’t have millions or enough to set up a fancy fund, but we are relatively successful within our families.
My BIL’s girlfriend fell out with us a few years ago - massive row, dragged in other family members, didn’t speak to us for months. This was because we send our kids to private school and she had assumed we’d be paying for her daughter from a previous relationship to go to private school as well.
We have literally never met her daughter, and we barely know BIL’s girlfriend. BIL passes through our city for work so we see him fairly often but don’t tend to visit him at home. There was never any possibility at all that we would pay her daughter’s school fees, even BIL was shocked at the suggestion so it didn’t come from him.
But she had heard about our kids’ school, assumed from pictures of our home that it was a lot more valuable than it actually is, and assumed we have an extra £20k a year that we’d love to use to fund a total stranger through school because apparently we should be treating her as part of the family.
When I pointed out that we don’t pay school fees for any of our nieces and nephews (we have 15 in total) who we actually know and have relationships with, she said that we should do it for her daughter precisely because we don’t have a relationship with her so we should prove that we still care about her and love her as a family member.
Absolutely insane how some people’s minds work once they get a whiff of money.
This was a lot less money at stake than you’re talking about, and only one lunatic, but it was still pretty unpleasant and stressful for a few months.