To think if you constantly try to keep up with jones you will always be miserable

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Speaking about sil
Fil brought them a house in posh area where she grew up as she longed to raise her kids there and couldn't afford to buy a house there.
She still miserable. according to her all her friends still have nicer car/ holidays/ days out/ furniture etc.
she behaving like an entitled bratt and I want to tell her so but don't want to upset my in laws.
We rent in a cheap area so we can afford to have a life.
We come from very different backgrounds ie she went to private school and grew up in wealthy area. I grew up on a council estate. I have so much more than my mum had and I know I'm very lucky even though husband has quite a modest job.

I am so close to slapping her and telling her to get a grip. Sorry rant over.

She could be miserable for other reasons.

I completely agree with you that you can't be happy if you don't allow yourself to be grateful for what you have, but some people do seem to have that kind of negativity built into them. It's very draining to be around, but it's genuinely not much fun being a person that can't see past what they don't have either.