P.M.
Since your mom is an adult, at least technically, that's the relationship that has the most potential for change. You say she's passive-aggressive, so I assume that means she does whatever she can to manipulate you emotionally, through anger, guilt, exasperation, sadness?
Here's an approach that I've learned over many years. I live next door to a mom who was (notice the past tense?) heavy on the neediness. I learned to say things like, "Mom, I hear that you'd really like me to ______. I've considered whether I can fit that in. And, the answer is no."
Two features of that answer: (1) You use the word AND instead of BUT. This indicates that you have considered her wishes, and are placing them on an equal plane with yours. (2) You don't give ANY reasons, excuses, rationalizations for your decision. Thus, there's very little for her to try to argue with. If she lures you into further discussion, you can go as far as speaking in terms of your own needs, as in "Mom, I do understand that this feels very important to you. And I am exhausted and overwhelmed, so the answer is no."
If she powers up the emotional screws, just let her. "I see that you're really unhappy about this. I have to go now. Let's talk again next week."
Consider, maybe in front of a mirror, how free and strong saying that would make you feel. Your mom won't like it – people hate letting go of predictable patterns. She may get angry. She may not speak to you for awhile. She may gossip about you to her neighbors or family. Will any of that be harder than where your relationship is right now?
Good luck. This is an important potential turning point for you. Go for it! My mom is now recovering from surgery, and I'm about to go help her bathe. Her need is real, and I haven't been drained by her manipulation in a long time, so I feel fine about doing this.