You've been so helpful in the past so I figured I'd ask for your help once more.
My partner has had a really rough childhood. They now have crippling complex PTSD which makes them unable to work and finish their studies. They have been on medical leave from work for the past 6 months and won't get back to work in the foreseeable future. It's not easy for them and it's not easy for me as someone who loves them and cares for them but we talk it out and manage to work out most of our difficulties together.
I'm concerned because I come from a family that is truly loving but at the same time have really right winged opinions, especially concerning work and being dependant on social services. They also believe in a lot of harmful stereotypes concerning mental illness.
They seem concerned for them and ask me about them a lot but I'm really scared of how they'd react and treat them if they knew they're not going to graduate and get a job and will pretty much be depending on me financially.
I'm scared my family will reject them or feel like they're not good for me. I just want everyone to get a long and for them to support me by supporting and accepting the person I love. I know I couldn't confront them if they ended up thinking all those bad things I fear because they wouldn't be upfront about it, it would just be an agressive and uncomfortable climate (which it already kind of is sometimes)...
I don't want to mention my fears to my partner because they're already going through so much and would be so hurt if they thought my family would reject them. I really don't know how to navigate and if I should trust my family or my instincts.
I think your partner needs to be included in whatever you decide to do in this case. As it is their reputation you are concerned for, your partner would best be able to tell you whether they wish your parents to know, or keep quiet, and which parts of that information they wish you to share.
As for confrontation, I know it can be concerning. But if your family is being unjust, and it is safe for you to refute them, sometimes it is, in fact, better for long term harmony to stand your ground. You do not have to do so unkindly, but these things have a way of festering, if you intend to maintain a relationship with your family.
Only you and your partner can truly decide which ground you are willing to give and which you must stand up for, but, and this is especially important given your partner's history, you must make this decision together. Taking away their agency does them no favors, If they have already seen some of this conflict with your family, you already have an easy opening. Tell them that you know your family can be difficult, and you wanted to know how they would like you to handle your family's questions.