"I have tentatively concluded that the benefits of telling Renée outweigh the risks. We already use her house as a base of operations, and not having to work around her would be much easier, especially now that we have three people who don't officially exist to hide. She exists - and her official existence is an adult; she can drive us places and so on. She can excuse me and Andi from school, if Charlie morphs her he can be out in public as long as they coordinate and not have to pretend he's not our parent, she can make sure we have enough food in the house - and I guess for Ax we experiment with commercially available forms of hay, there aren't going to be grass clippings in Phoenix so readily available - to sustain extra people. She's flighty but not terrible with secrets. I do think we might want to avoid teaching her specialized vocabulary like 'Yeerk' or 'Escafil' or whatever, because that seems like the easier slip for her to make, but I think we should tell her what's going on. Charlie will be able to convince her that we can't just turn over the issue to the authorities."
Bella gets ahold of Renée on the phone the following morning. She has an intensely difficult conversation, part of which she actually spends crying; she hands the phone to Andi at Renée's request at one point; she takes it back; Renée promises to be in Forks before midnight, she's going to drive straight there, her friends will catch a train home, they'll understand.
"The short version is, aliens exist, one was possessing him, the others would notice if he just stopped showing up to alien meetings, we killed it but Charlie has to look dead for them not to be tipped off. Other, nicer aliens also exist and gave us powers and there is one of those in the garage."
"Ax's brother crash-landed conveniently near us not too long ago and gave us some garage alien technology that lets us do it. We have to touch the animals to get them. We raided a zoo, a while back. And we're trying to come up with ways to use that ability and anything else we can get ahold of to get rid of possessor aliens."
"We don't have to all fit in the car. Trouble and Charlie need generic human morphs and will be flying to some population center where they won't be recognized to acquire the component humans. It would be nice to stow Ax and Ethan away with us in small morphs, so we'd have to stop occasionally to let them change out and back again - Ethan might be able to do it in transit, Ax can't - but that doesn't seem like it should be that serious a problem if we drive at night and don't take crowded highways, and if it proves really complicated they can get out and fly."