<human>: Can you succinctly summarize the text in 1-3 sentences?

I live with three roommates. (The third roommate is the 24 f's sister, and has spent enough time living around her that she knows how to not get on her bad side. Even then she was hesitant about moving in with them for reasons I now understand)

Her (24 f) main problem is that she has a really hard time handling *any* stress. Whenever I bring up anything important to her, she either panics, or hypocritically tells me to "calm down" unless I'm wording it in the gentlest way possible.

He (25 m) can be the coolest person on the planet, but is extremely moody and will sometimes wake up in the morning and treat everyone else like they've just killed his dog for the entire day. He gets real quiet angry, may refuse to talk to you, and if he does talk you might wish he didn't.

Because they're in a relationship, it feels like they have eachothers' backs even when they shouldn't. I've found some success by trying to appease them, but when I look at the prospect of walking on eggshells the entire time I'm living with them, it feels distasteful and even a little unhealthy, emotionally.

There's a really big part of me that wants to outright confront them about it. I was close friends with them before this, and I might be able to use that to my advantage, but it could go really badly.

What's the right way to proceed here?
<bot>: Very sensitive roommates are in a relationship and egg each other on. Unsure of whether to call them out, or self-censor for civility's sake.