My FIL is very annoyed to find out his son (my DH) earns more money than he thought he did. DH not a massive earner but is middle management. We don't ask him for money, and he is retired and has enough to have a good lifestyle (and can afford increased living costs - although he hates them as he has always been frugal). Why would he be annoyed? I would be happy my DC were doing better than me - or is this a normal reaction?