Crenshaw by Katherine Applegate

Jackson and his family have fallen on hard times. There's no more money for rent. And not much for food, either. His parents, his little sister, and their dog may have to live in their minivan. Again.
Crenshaw is a cat. He's large, he's outspoken, and he's imaginary. He has come back into Jackson's life to help him. But is an imaginary friend enough to save this family from losing everything?
Beloved author Katherine Applegate proves in unexpected ways that friends matter, whether real or imaginary.

Eight boys and girls compete for a spot on the space voyage that'll search for a source to solve Earth's energy crisis.

The action is on the page, on your device, and out of this world! This multiplatform series is part sci-fi, part eco-mystery, all action-adventure. And six books are coming all in one year!

Gypsy Beaumont has always been a whirly-twirly free spirit, so as her thirteenth birthday approaches, she hopes to get a magical ability that will let her fly, or dance up to the stars. Instead, she wakes up on her birthday with blurry vision... and starts seeing flashes of the future and past. But when Momma and Poppa announce that her very unmagical, downright mean Grandma Pat has Alzheimer's and is going to move in with them, Gypsy's savvy, along with her family's, suddenly becomes its opposite. Now it's savvy mayhem as Gypsy starts freezing time, and no one could have predicted what would happen on their trip to bring Grandma Pat home... not even Gypsy.