Blatant showing off starting to get really tiresome/distasteful

I really don't see other people's posts as bragging. Should we all pretend to lead uneventful lives just so that others feel OK? Chips on shoulders on display here?

I would just let it go over my head. No real need to comment if look for that matter, this is the only social media I do, but wouldn't show my face as I’m very private. A lot show every part of their day.

This is why I soon stopped using Facebook as I found some of the bragging annoying. I think people who boast about what they have and the exciting things they do are very shallow.
I question how happy people like this really are. I live my life, enjoy lots of things but don't need others to know what I am doing.

There are some show-offs in this world, fortunately , none (that annoy me) among my family/friends. However, one of my friends has a pretty granddaughter, who ‘people stare at’, whenever she goes out with her.
I think your relative is very ‘shallow’ - she should be helping her children out, if they are struggling. My advice is to just ignore those posts and don’t ‘like’ them or make any comment .

It's just her life she's posting about. If you don't want to know about it then just don't read it.

I'd just mute her/unfollow if it is upsetting you

Why does it bother you? Just ignore it.
It’s up to them how they spend their money.