That's good though, you're reaching a stage where the resentment outweighs the (natural) feeling of obligation, of being scared to rock the boat, of being guilty of you change the status quo. That resentment may very well be the tool you can use to set you free!
You deserve to live without resentment. That might mean low or no contact, for a while or for ever, even. You deserve to be happy. Also, your job is to teach your little family what is acceptable behaviour to tolerate from someone else. I refuse to teach my kids that they should tolerate rude/racist/mean people whether they are strangers or family (those are just examples lol, I'm sure you have plenty of your own, sadly😅)
I have a similar family and I dread days like today... What has helped most is therapy (and I'd love more!) plus rebuilding my boundaries constantly. And realising that they CHOOSE to act that way, to treat us this way, and it is categorically not good enough. I wouldn't take it at work, not from a stranger, so why should they be able to affect me so badly, why should I allow it. The cons massively outweigh the pros. I can go back in time in my head and soothe myself as a youngster, the way I do with my own kids, to provide what was lacking back then and to bolster me as an adult. That definitely takes practise though, that sort of reverse-time love and support for previous "little you", if that makes sense?!
I don't make information about myself available freely to them either, as they might use it to hurt me, I don't prioritise them if doing so ends up transporting me back to feeling small, stupid and unloved. .
They have this unique skill of not knowing who we really are, but also knowing exactly how to deconstruct our happiness and self belief. I'm done with it! This is our one short life haha, such a shame to waste it on people who just don't or can't care enough. I'm at a stage where I can see WHY they are how they are, bad childhoods etc, but again, they cannot ever give me equality or what I need to feel secure in the relationship, so... I've had to make choices. They choose to be this way, they could choose to learn from their horrible pasts and not pass on their misery. But they don't.
If I were you I'd keep up with the therapy and allow yourself to feel, but gradually take away their "keys" to your life. Any info, anything that puts you on the back foot, keep it to yourself and people who truly value you.