Elly: She started off by making a big, stupid excuse about how Mike and Dee couldn't move to a place as nice as Lovey's barn until their insurance claims were settled; she did notice that they'd expropriated April's room and vaguely wished that Liz would move out but didn't want to push the issue after Evil Paul cheated on her. What this tells me is that she's a God-damned ostrich who couldn't be bothered figuring out what was going on because she wants to believe that everything is fine.
John: We can summarize him by the phrase 'condescending God-damned idiot with his head up his arse'; this is because he started off blathering witlessly about her being a princess because he was too stupid and arrogant to want to actually God-damned find out why she was upset and spent the rest of the year clucking reprovingly about hormones before his oh-so-slow mental processes finally made him come to the conclusion "Chee!! Maybe April feels that we don't give a rat's ass about her."
Mike: He was vaguely aware that the move upset April for reasons that escape him (I love how Mister Bug-on-the-windshield called HER melodramatic) but hadn't the vaguest notion that he wasn't as nearly as close to his little buddy or that April didn't give him her room as much as she was ordered to sleep in the rec room. He also hadn't the vaguest idea that John and Elly were not the only ones to betray her.
Deanna: According to her, April volunteered to give up her room which was real swell of her; her idea of repaying her for her enforced generosity was to want to more or less adopt her so as to convert her to a family retainer.
Liz: She vaguely hints that April is somewhat crabby but thinks that her moving out was a quick fix.
April: We finally hit paydirt; we start with her acknowledging that Mike and Dee somehow need their own lavatory but feels awkward about the whole thing on top of hoping that things get back on track sooner rather than later. We next have her talking about wondering where Mike and Deanna find the patience to deal with the children they don't actually deal with and how Liz is too full of herself to care about what's going on around her before we get to the meat in the Housening sandwich: her ambivalence about moving. The letters paint a portrait of a young woman who knows that this is the only way she can get her own space but still feels a bit frightened by change; what shines through is the fact that she doesn't feel as if there's anyone she can talk to about things. John and Elly are too distant and panicky, Mike is an idiot, Liz is a know-it-all, her bandmates are out of town and Deanna can't keep secrets.
To sum it up, what we have is a bunch of panicky, self-righteous, thin-skinned imbeciles seeing defiance where none exists because they expect to see it and a well-meaning but slightly ticked-off teenager who would feel better if she could simply communicate with someone.